Question

Use the formula to multiply:

(1) (p + 4) (p + 7)

Answer 1

As (x + a) (x + b) = x² + (a + b)x + ab
So, (p + 4) (p + 7) = p² + (4 + 7)p + (7)(4)
= p² + 11p + 28
∴ (p + 4) (p + 7) = p² + 11p + 28