One added to the square root of the sum of a number and eight is equal to four. Find the number.

Question

One added to the square root of the sum of a number and eight is equal to four. Find the number.

Answer 1

1 + √(x+8) = 4

Subtract 1 from both sides

√(x+8) = 3

Square both sides

x+8 = 9

x=1