Question

Multiply: (x – 4)(x + 5)

(a) x2 + 5x - 20

(b) x2 - 4x - 20

(c) x2 - x - 20

(d) x2 + x - 20

Answer 1

The answer to (x-4)(x+5) is d

Answer 2

Answer is D.

Explanation:

(x – 4)(x + 5)

= x(x + 5) -4(x + 5)

= x2 + 5x – 4x – 20

= x2 + x - 20