Question

Solve this equation: (x + 4) (x - 4) = 9

Answer 1

x^2 - 4^2 =9
x^2 = 9 +16
x^2 = 25
x = root 25
x = 5

Answer 2

x^2-4^2=9

X^2-16=9

X^2=9+16

X^2=25

X= underroot of 25

X= 5