Multiply: (x – 4)(x + 5)
Options.
A) (a) x2 + 5x - 20 B) (b) x2 - 4x - 20 C) (c) x2 - x - 20 D) (d) x2 + x - 20 E) (e) x2 + x + 20
(x – 4)(x + 5).   = x(x + 5) -4(x + 5).   = x2 + 5x – 4x – 20.   = x2 + x - 20   the answer is ((d) x2 + x - 20)
<result>D</result>
Multiply: (x – 4)(x + 5)