<< Chapter < Page Chapter >> Page >

f ( x ) = 2 x 3 9 x 2 + 13 x 6 ;   x 1

Got questions? Get instant answers now!

f ( x ) = 2 x 3 + x 2 5 x + 2 ;   x + 2

2 ,   1 ,   1 2

Got questions? Get instant answers now!

f ( x ) = 3 x 3 + x 2 20 x + 12 ;   x + 3

Got questions? Get instant answers now!

f ( x ) = 2 x 3 + 3 x 2 + x + 6 ; x + 2

2

Got questions? Get instant answers now!

f ( x ) = 5 x 3 + 16 x 2 9 ; x 3

Got questions? Get instant answers now!

x 3 + 3 x 2 + 4 x + 12 ; x + 3

3

Got questions? Get instant answers now!

4 x 3 7 x + 3 ; x 1

Got questions? Get instant answers now!

2 x 3 + 5 x 2 12 x 30 , 2 x + 5

5 2 ,   6 ,   6

Got questions? Get instant answers now!

For the following exercises, use the Rational Zero Theorem to find all real zeros.

x 3 3 x 2 10 x + 24 = 0

Got questions? Get instant answers now!

2 x 3 + 7 x 2 10 x 24 = 0

2 ,   4 ,   3 2

Got questions? Get instant answers now!

x 3 + 2 x 2 9 x 18 = 0

Got questions? Get instant answers now!

x 3 + 5 x 2 16 x 80 = 0

4 ,   4 ,   5

Got questions? Get instant answers now!

x 3 3 x 2 25 x + 75 = 0

Got questions? Get instant answers now!

2 x 3 3 x 2 32 x 15 = 0

5 ,   3 ,   1 2

Got questions? Get instant answers now!

2 x 3 + x 2 7 x 6 = 0

Got questions? Get instant answers now!

2 x 3 3 x 2 x + 1 = 0

1 2 ,   1 + 5 2 ,   1 5 2

Got questions? Get instant answers now!

3 x 3 x 2 11 x 6 = 0

Got questions? Get instant answers now!

2 x 3 5 x 2 + 9 x 9 = 0

3 2

Got questions? Get instant answers now!

2 x 3 3 x 2 + 4 x + 3 = 0

Got questions? Get instant answers now!

x 4 2 x 3 7 x 2 + 8 x + 12 = 0

2 ,   3 ,   1 ,   2

Got questions? Get instant answers now!

x 4 + 2 x 3 9 x 2 2 x + 8 = 0

Got questions? Get instant answers now!

4 x 4 + 4 x 3 25 x 2 x + 6 = 0

1 2 ,   1 2 ,   2 ,   3

Got questions? Get instant answers now!

2 x 4 3 x 3 15 x 2 + 32 x 12 = 0

Got questions? Get instant answers now!

x 4 + 2 x 3 4 x 2 10 x 5 = 0

1 ,   1 ,   5 ,   5

Got questions? Get instant answers now!

8 x 4 + 26 x 3 + 39 x 2 + 26 x + 6

3 4 ,   1 2

Got questions? Get instant answers now!

For the following exercises, find all complex solutions (real and non-real).

x 3 8 x 2 + 25 x 26 = 0

2 ,   3 + 2 i ,   3 2 i

Got questions? Get instant answers now!

x 3 + 13 x 2 + 57 x + 85 = 0

Got questions? Get instant answers now!

3 x 3 4 x 2 + 11 x + 10 = 0

2 3 ,   1 + 2 i ,   1 2 i

Got questions? Get instant answers now!

x 4 + 2 x 3 + 22 x 2 + 50 x 75 = 0

Got questions? Get instant answers now!

2 x 3 3 x 2 + 32 x + 17 = 0

1 2 ,   1 + 4 i ,   1 4 i

Got questions? Get instant answers now!

Graphical

For the following exercises, use Descartes’ Rule to determine the possible number of positive and negative solutions. Confirm with the given graph.

f ( x ) = x 4 x 2 1

1 positive, 1 negative

Graph of f(x)=x^4-x^2-1.
Got questions? Get instant answers now!

f ( x ) = x 3 2 x 2 5 x + 6

Got questions? Get instant answers now!

f ( x ) = x 3 2 x 2 + x 1

3 or 1 positive, 0 negative

Graph of f(x)=x^3-2x^2+x-1.
Got questions? Get instant answers now!

f ( x ) = x 4 + 2 x 3 12 x 2 + 14 x 5

Got questions? Get instant answers now!

f ( x ) = 2 x 3 + 37 x 2 + 200 x + 300

0 positive, 3 or 1 negative

Graph of f(x)=2x^3+37x^2+200x+300.
Got questions? Get instant answers now!

f ( x ) = x 3 2 x 2 16 x + 32

Got questions? Get instant answers now!

f ( x ) = 2 x 4 5 x 3 5 x 2 + 5 x + 3

2 or 0 positive, 2 or 0 negative

Graph of f(x)=2x^4-5x^3-5x^2+5x+3.
Got questions? Get instant answers now!

f ( x ) = 2 x 4 5 x 3 14 x 2 + 20 x + 8

Got questions? Get instant answers now!

f ( x ) = 10 x 4 21 x 2 + 11

2 or 0 positive, 2 or 0 negative

Graph of f(x)=10x^4-21x^2+11.
Got questions? Get instant answers now!

Numeric

For the following exercises, list all possible rational zeros for the functions.

f ( x ) = x 4 + 3 x 3 4 x + 4

Got questions? Get instant answers now!

f ( x ) = 2 x 3 + 3 x 2 8 x + 5

± 5 ,   ± 1 ,   ± 5 2

Got questions? Get instant answers now!

f ( x ) = 3 x 3 + 5 x 2 5 x + 4

Got questions? Get instant answers now!

f ( x ) = 6 x 4 10 x 2 + 13 x + 1

± 1 ,   ± 1 2 ,   ± 1 3 ,   ± 1 6

Got questions? Get instant answers now!

f ( x ) = 4 x 5 10 x 4 + 8 x 3 + x 2 8

Got questions? Get instant answers now!

Technology

For the following exercises, use your calculator to graph the polynomial function. Based on the graph, find the rational zeros. All real solutions are rational.

f ( x ) = 6 x 3 7 x 2 + 1

1 ,   1 2 ,   1 3

Got questions? Get instant answers now!

f ( x ) = 4 x 3 4 x 2 13 x 5

Got questions? Get instant answers now!

f ( x ) = 8 x 3 6 x 2 23 x + 6

2 ,   1 4 ,   3 2

Got questions? Get instant answers now!

f ( x ) = 12 x 4 + 55 x 3 + 12 x 2 117 x + 54

Got questions? Get instant answers now!

f ( x ) = 16 x 4 24 x 3 + x 2 15 x + 25

5 4

Got questions? Get instant answers now!

Extensions

For the following exercises, construct a polynomial function of least degree possible using the given information.

Real roots: –1, 1, 3 and ( 2 , f ( 2 ) ) = ( 2 , 4 )

Got questions? Get instant answers now!

Real roots: –1 (with multiplicity 2 and 1) and ( 2 , f ( 2 ) ) = ( 2 , 4 )

f ( x ) = 4 9 ( x 3 + x 2 x 1 )

Got questions? Get instant answers now!

Real roots: –2, 1 2 (with multiplicity 2) and ( 3 , f ( 3 ) ) = ( 3 , 5 )

Got questions? Get instant answers now!

Real roots: 1 2 , 0, 1 2 and ( 2 , f ( 2 ) ) = ( 2 , 6 )

f ( x ) = 1 5 ( 4 x 3 x )

Got questions? Get instant answers now!

Real roots: –4, –1, 1, 4 and ( 2 , f ( 2 ) ) = ( 2 , 10 )

Got questions? Get instant answers now!

Real-world applications

For the following exercises, find the dimensions of the box described.

The length is twice as long as the width. The height is 2 inches greater than the width. The volume is 192 cubic inches.

8 by 4 by 6 inches

Got questions? Get instant answers now!

The length, width, and height are consecutive whole numbers. The volume is 120 cubic inches.

Got questions? Get instant answers now!

The length is one inch more than the width, which is one inch more than the height. The volume is 86.625 cubic inches.

5.5 by 4.5 by 3.5 inches

Got questions? Get instant answers now!

The length is three times the height and the height is one inch less than the width. The volume is 108 cubic inches.

Got questions? Get instant answers now!

The length is 3 inches more than the width. The width is 2 inches more than the height. The volume is 120 cubic inches.

8 by 5 by 3 inches

Got questions? Get instant answers now!

For the following exercises, find the dimensions of the right circular cylinder described.

The radius is 3 inches more than the height. The volume is 16 π cubic meters.

Got questions? Get instant answers now!

The height is one less than one half the radius. The volume is 72 π cubic meters.

Radius = 6 meters, Height = 2 meters

Got questions? Get instant answers now!

The radius and height differ by one meter. The radius is larger and the volume is 48 π cubic meters.

Got questions? Get instant answers now!

The radius and height differ by two meters. The height is greater and the volume is 28.125 π cubic meters.

Radius = 2.5 meters, Height = 4.5 meters

Got questions? Get instant answers now!

80. The radius is 1 3 meter greater than the height. The volume is 98 9 π cubic meters.

Got questions? Get instant answers now!

Questions & Answers

find the equation of the tangent to the curve y=2x³-x²+3x+1 at the points x=1 and x=3
Esther Reply
derivative of logarithms function
Iqra Reply
how to solve this question
sidra
ex 2.1 question no 11
khansa
anyone can help me
khansa
question please
Rasul
ex 2.1 question no. 11
khansa
i cant type here
khansa
Find the derivative of g(x)=−3.
Abdullah Reply
any genius online ? I need help!!
Guzorochi Reply
how can i help you?
Pina
need to learn polynomial
Zakariya
i will teach...
nandu
I'm waiting
Zakariya
plz help me in question
Abish
How can I help you?
Tlou
evaluate the following computation (x³-8/x-2)
Murtala Reply
teach me how to solve the first law of calculus.
Uncle Reply
teach me also how to solve the first law of calculus
Bilson
what is differentiation
Ibrahim Reply
only god knows😂
abdulkadir
f(x) = x-2 g(x) = 3x + 5 fog(x)? f(x)/g(x)
Naufal Reply
fog(x)= f(g(x)) = x-2 = 3x+5-2 = 3x+3 f(x)/g(x)= x-2/3x+5
diron
pweding paturo nsa calculus?
jimmy
how to use fundamental theorem to solve exponential
JULIA Reply
find the bounded area of the parabola y^2=4x and y=16x
Omar Reply
what is absolute value means?
Geo Reply
Chicken nuggets
Hugh
🐔
MM
🐔🦃 nuggets
MM
(mathematics) For a complex number a+bi, the principal square root of the sum of the squares of its real and imaginary parts, √a2+b2 . Denoted by | |. The absolute value |x| of a real number x is √x2 , which is equal to x if x is non-negative, and −x if x is negative.
Ismael
find integration of loge x
Game Reply
find the volume of a solid about the y-axis, x=0, x=1, y=0, y=7+x^3
Godwin Reply
how does this work
Brad Reply
Can calculus give the answers as same as other methods give in basic classes while solving the numericals?
Cosmos Reply
log tan (x/4+x/2)
Rohan
please answer
Rohan
y=(x^2 + 3x).(eipix)
Claudia
is this a answer
Ismael
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply
Practice Key Terms 6

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




Source:  OpenStax, Precalculus. OpenStax CNX. Jan 19, 2016 Download for free at https://legacy.cnx.org/content/col11667/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Precalculus' conversation and receive update notifications?

Ask