How do you solve 7+ \sqrt { x - 1} = 9?

1 Answer
Dec 2, 2016

x=5

Explanation:

7+sqrt(x−1)=9

Put x-1 on one side and move 7 to the other side.

sqrt(x−1)=9-7

sqrt(x−1)=2

To get rid of the square root, we square sqrt(x−1) by 2. But we have to square the other side too.

x-1=2^2

x-1=4

x=4+1

x=5