Question

Use the suitable identity , find the following product
(2x + 5y) (2x + 3y) OR (4x + 5) (4x – 1)​

Answer 1

Explanation:

1. 4x² + 16xy + 15y²

2. 16x² + 16x - 5

Answer 2

Explanation:

Comparing (2x + 5y) (2x + 3y) with identity (x + a)(x + b),

(2x +5y) (2x + 3y) = (2x)²+ (5y + 3y) (2x) + (5y) (3y)

= 4x² + 16xy + 15y