Solve the equation. Check your answer.

Question

√c = 20

Answer 1

√c = 20

c = 400         square both sides

 

Check:

√400

√((4)(100))

√((2²)(10²))

(2)(10)

20

 

Answer 2

to eliminate a square root, you isolate the square root on one side of the equation (which has already been done), then square both sides to get c = 400. Any check means to plug your answer into the original equation and then evaluate each side according to the order of operations. In your case you get √400 = 20.......20=20, so you've got the right answer.

Hope this helped.

Answer 3

sqrt(c)^2=c. If sqrt(c)=20, then sqrt(c)^2=20^2=400.