Question

Multiply: (x – 4)(x + 5)

(a) x2 + 5x - 20,

(b) x2 - 4x - 20,

(c) x2 - x - 20,

(d) x2 + x - 20.

Answer 1

Answer:

OPTION D

Step-by-step explanation:

(x – 4)(x + 5).

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

= x2 + 5x – 4x – 20.

= x2 + x - 20.

Answer 2

Answer:

(d) x2 + x - 20.

Step-by-step explanation:

(x-4) (x+5)

= x² + 5x - 4x - 20

= x² +x - 20.