Answer:
4 and - 2
Step-by-step explanation:
f ( x ) = x^2 - 2x - 3
f ( x ) = 5
x^2 - 2x - 3 = 5
x^2 - 2x - 3 - 5 = 0
x^2 - 2x - 8 = 0
x^2 + 2x - 4x - 8 = 0
x ( x + 2 ) - 4 ( x + 2 ) = 0
( x - 4 ) ( x + 2 ) = 0
x - 4 = 0
x = 4
x + 2 = 0
x = - 2
x has 2 values,
x = 4, - 2
