Question

Solve for y, where y is a real number square root of y-9=8

Answer 1

73

Explanation:

First, to get rid of the square root, square both sides of the equation to get:

y-9=64

Then, move 9 to the other side to get

y=73

Answer 2

y = 73

Explanation:

sqrt(y-9) = 8

Square each side

(sqrt(y-9))^2 = 8^2

y-9 = 64

Add 9 to each side

y-9+9 = 64+9

y = 73

Since we squared each side, we have to check and see if the solution is valid

sqrt(73-9) = 8

sqrt(64) = 8

8=8

it is a valid solution