Question

Evaluate x² + 2x – 1 when x =

a) 0


b) -2


c) 4

Answer 1

Substitute respective values of x into the equation.

a) When x = 0,

(0)² + 2(0) - 1 = -1

Ans: -1

b) When x = -2,

(-2)² + 2(-2) -1 = 4 + (-4) - 1

= - 1

Ans: -1

c) When x = 4,

(4)² + 2(4) - 1 = 16 + 8 - 1

= 23

Ans: 23