Question

If x>3, then the equation √(x+9)= x-3 equals which of the following?

x=x^2

x=x^2+18

x=x^2-6x

x=x^2-6x+9

x=x^2-6x+18

Answer 1

If x>3, then both side are positive

that means, u can square the equation

Answer 2

how do i do that?

Answer 3

\[\sqrt{x+9}=x-3\]
\[\sqrt{x+9}^2=(x-3)^2\]\[\ x+9=x^2-6x+9\]

Answer 4

ahh, thanx!