Question

Use the formula to multiply:

(12) (2x + 7) (2x + 3)

Answer 1

As (y + a) (y + b) = y² + (a + b)y + ab
So, (2x + 7) (2x + 3) = 4x² + (6 + 14)x + 21
= 4x² + 20x + 21

∴ (2x + 7) (2x + 3) = 4x² + 20x + 21