Question

Use the formula to multiply:

(3) (q – 3) (q + 8)

Answer 1

As (x + a) (x + b) = x² + (a + b)x + ab
So, (q – 3) (q + 8) = q² + (–3 + 8)q – 24
= q² + 5q – 24
∴ (q – 3) (q + 8) = q² + 5q – 24