+0  
 
0
590
1
avatar

Which expression is equal to 7√28−5√63 ?

 

A. −11√7

B. −37√7

C. −√7

D. √7

 

Simplify 5√ 12xm^3.

Assume x and m are nonnegative.

 

A. 60m^3√ x

B. 60√ xm^3

C. 10m^3√ 3x

D. 10m√ 3xm

 

Which expression is equal to 5/√13√ ?

 

A. 25/13

B. √65/13

C. √5/13

D. 5√13/13

Guest Sep 17, 2017
 #1
avatar
0

square root of 28 is just a matter of breaking it down

2*2*7= 28 you have two 2's or its like square root of 4=2

however you want to see it, so the 2 can come out and you have 7*2 square root of 7

14sqrt7 

do the same with the other, you know the 7 has to be left cause the answers all have sqrt7

what times 7 =63 well 9, sqrt 9=3 so the 3 comes out

5*3=15 so you have 15sqrt7

like terms now, so 14-15=-1

answer is -1sqrt7 or C

 

sqrt12 is sqrt 4*3 so sqrt 4 is 2, 2 comes out, 3 stays in.

5*2=10, 10sqrt3, the m^3 is m*m*m so you can say two of those m's allow it to come out

only one x so it can not come out so 10msqrt3mx or D

 

one way to get the sqrt out of the denomiator or bottom of the fraction is 

to multiply by 1 or in this case sqrt13/sqrt13. this leaves 13 on the bottom and sqrt13 on the top

D is the only answer that meets that

Guest Sep 17, 2017

11 Online Users

avatar
avatar
avatar
avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.