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( x 8 y 10 ) 1 2
( a 9 b 12 ) 1 3

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( r 8 s 4 ) 1 4
( u 15 v 20 ) 1 5

r 2 s u 3 v 4

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( a 6 b 16 ) 1 2
( j 9 k 6 ) 2 3

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( r 16 s 10 ) 1 2
( u 10 v 5 ) 4 5

r 8 s 5 u 8 v 4

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r 5 2 · r 1 2 r 3 2
s 1 5 · s s 9 5

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a 3 4 · a 1 4 a 10 4
b 2 3 · b b 7 3

a 3 b 4

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c 5 3 · c 1 3 c 2 3
d 3 5 · d d 2 5

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m 7 4 · m 5 4 m 2 4
n 3 7 · n n 4 7

m n 2

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( 64 s 3 5 ) 1 6

2 s 1 10

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( u 12 v 18 ) 1 6

u 2 v 3

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Everyday math

Landscaping Joe wants to have a square garden plot in his backyard. He has enough compost to cover an area of 144 square feet. Simplify 144 1 2 to find the length of each side of his garden.

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Landscaping Elliott wants to make a square patio in his yard. He has enough concrete to pave an area of 242 square feet. Simplify 242 1 2 to find the length of each side of his patio.Round to the nearest tenth of a foot.

15.6 feet

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Gravity While putting up holiday decorations, Bob dropped a decoration from the top of a tree that is 12 feet tall. Simplify 12 1 2 16 1 2 to find how many seconds it took for the decoration to reach the ground. Round to the nearest tenth of a second.

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Gravity An airplane dropped a flare from a height of 1024 feet above a lake. Simplify 1024 1 2 16 1 2 to find how many seconds it took for the flare to reach the water.

8 seconds

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Writing exercises

Show two different algebraic methods to simplify 4 3 2 . Explain all your steps.

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Explain why the expression ( −16 ) 3 2 cannot be evaluated.

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Section 9.1 Simplify and Use Square Roots

Simplify Expressions with Square Roots

In the following exercises, simplify.

Estimate Square Roots

In the following exercises, estimate each square root between two consecutive whole numbers.

Approximate Square Roots

In the following exercises, approximate each square root and round to two decimal places.

Simplify Variable Expressions with Square Roots

In the following exercises, simplify.

Section 9.2 Simplify Square Roots

Use the Product Property to Simplify Square Roots

In the following exercises, simplify.

108 r 5 s 3

6 r 2 s 3 r s

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Use the Quotient Property to Simplify Square Roots

In the following exercises, simplify.

36 r 10 16 r 5

3 r 2 r 2

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12 r 5 s 7 75 r 2 s

2 r s 3 r 5

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Section 9.3 Add and Subtract Square Roots

Add and Subtract Like Square Roots

In the following exercises, simplify.

8 13 + 2 3 + 3 13

11 13 + 2 3

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3 5 x y 5 x y + 3 5 x y

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2 3 r s + 3 r s 5 r s

3 3 r s 5 r s

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Add and Subtract Square Roots that Need Simplification

In the following exercises, simplify.

6 18 n 4 3 8 n 4 + n 2 50

17 n 2 2

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Section 9.4 Multiply Square Roots

Multiply Square Roots

In the following exercises, simplify.

( 6 2 y ) ( 3 50 y 3 )

180 y 2

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Use Polynomial Multiplication to Multiply Square Roots

In the following exercises, simplify.

10 ( 2 7 )

20 10 7

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( 5 + 2 ) ( 3 2 )

13 2 2

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( 5 3 7 ) ( 1 2 7 )

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( 1 3 x ) ( 5 + 2 x )

5 13 x 6 x

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( 3 + 4 y ) ( 10 y )

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( 1 + 6 p ) 2

1 + 12 p + 36 p

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( 3 + 2 7 ) ( 3 2 7 )

−19

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Section 9.5 Divide Square Roots

Divide Square Roots

Questions & Answers

how did you get 1640
Noor Reply
If auger is pair are the roots of equation x2+5x-3=0
Peter Reply
Wayne and Dennis like to ride the bike path from Riverside Park to the beach. Dennis’s speed is seven miles per hour faster than Wayne’s speed, so it takes Wayne 2 hours to ride to the beach while it takes Dennis 1.5 hours for the ride. Find the speed of both bikers.
MATTHEW Reply
420
Sharon
from theory: distance [miles] = speed [mph] × time [hours] info #1 speed_Dennis × 1.5 = speed_Wayne × 2 => speed_Wayne = 0.75 × speed_Dennis (i) info #2 speed_Dennis = speed_Wayne + 7 [mph] (ii) use (i) in (ii) => [...] speed_Dennis = 28 mph speed_Wayne = 21 mph
George
Let W be Wayne's speed in miles per hour and D be Dennis's speed in miles per hour. We know that W + 7 = D and W * 2 = D * 1.5. Substituting the first equation into the second: W * 2 = (W + 7) * 1.5 W * 2 = W * 1.5 + 7 * 1.5 0.5 * W = 7 * 1.5 W = 7 * 3 or 21 W is 21 D = W + 7 D = 21 + 7 D = 28
Salma
Devon is 32 32​​ years older than his son, Milan. The sum of both their ages is 54 54​. Using the variables d d​ and m m​ to represent the ages of Devon and Milan, respectively, write a system of equations to describe this situation. Enter the equations below, separated by a comma.
Aaron Reply
find product (-6m+6) ( 3m²+4m-3)
SIMRAN Reply
-42m²+60m-18
Salma
what is the solution
bill
how did you arrive at this answer?
bill
-24m+3+3mÁ^2
Susan
i really want to learn
Amira
I only got 42 the rest i don't know how to solve it. Please i need help from anyone to help me improve my solving mathematics please
Amira
Hw did u arrive to this answer.
Aphelele
hi
Bajemah
-6m(3mA²+4m-3)+6(3mA²+4m-3) =-18m²A²-24m²+18m+18mA²+24m-18 Rearrange like items -18m²A²-24m²+42m+18A²-18
Salma
complete the table of valuesfor each given equatio then graph. 1.x+2y=3
Jovelyn Reply
x=3-2y
Salma
y=x+3/2
Salma
Hi
Enock
given that (7x-5):(2+4x)=8:7find the value of x
Nandala
3x-12y=18
Kelvin
please why isn't that the 0is in ten thousand place
Grace Reply
please why is it that the 0is in the place of ten thousand
Grace
Send the example to me here and let me see
Stephen
A meditation garden is in the shape of a right triangle, with one leg 7 feet. The length of the hypotenuse is one more than the length of one of the other legs. Find the lengths of the hypotenuse and the other leg
Marry Reply
how far
Abubakar
cool u
Enock
state in which quadrant or on which axis each of the following angles given measure. in standard position would lie 89°
Abegail Reply
hello
BenJay
hi
Method
I am eliacin, I need your help in maths
Rood
how can I help
Sir
hmm can we speak here?
Amoon
however, may I ask you some questions about Algarba?
Amoon
hi
Enock
what the last part of the problem mean?
Roger
The Jones family took a 15 mile canoe ride down the Indian River in three hours. After lunch, the return trip back up the river took five hours. Find the rate, in mph, of the canoe in still water and the rate of the current.
cameron Reply
Shakir works at a computer store. His weekly pay will be either a fixed amount, $925, or $500 plus 12% of his total sales. How much should his total sales be for his variable pay option to exceed the fixed amount of $925.
mahnoor Reply
I'm guessing, but it's somewhere around $4335.00 I think
Lewis
12% of sales will need to exceed 925 - 500, or 425 to exceed fixed amount option. What amount of sales does that equal? 425 ÷ (12÷100) = 3541.67. So the answer is sales greater than 3541.67. Check: Sales = 3542 Commission 12%=425.04 Pay = 500 + 425.04 = 925.04. 925.04 > 925.00
Munster
difference between rational and irrational numbers
Arundhati Reply
When traveling to Great Britain, Bethany exchanged $602 US dollars into £515 British pounds. How many pounds did she receive for each US dollar?
Jakoiya Reply
how to reduced echelon form
Solomon Reply
Jazmine trained for 3 hours on Saturday. She ran 8 miles and then biked 24 miles. Her biking speed is 4 mph faster than her running speed. What is her running speed?
Zack Reply
d=r×t the equation would be 8/r+24/r+4=3 worked out
Sheirtina
Practice Key Terms 1

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Source:  OpenStax, Elementary algebra. OpenStax CNX. Jan 18, 2017 Download for free at http://cnx.org/content/col12116/1.2
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