Question

How do you solve this?

Answer 1

Add 16
x² - 16 = 0
+ 16 +16

x² = 16
Take square root


`√(x^2) = √(16)`

Remember when you take the square root of a perfect square you get two values. +ve and -ve

x = -4
x = 4

because (-4)² = 16
( 4)² = 16

Answer 2

you X to the second power.. 4 to the second power is 16 and 16-16=0 so x=4