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:

Step-by-step explanation:

Solution:

(x – 4)(x + 5).

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

= x2 + 5x – 4x – 20.

= x2 + x - 20.

Answer: (d)

Answer 2

Answer:

(d)

Step-by-step explanation:

(x-4)(x+5)

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

= x²+5x-4x-20