Question

Solve : x² – 16 = 0

Answer 1

`x^2 - 16 = 0`

`=> x^2 - 4^2 = 0`

`=> (x + 4)(x - 4) = 0`

Since x + 4 = 0 or x - 4 = 0

then x = -4 or x = 4