Question

Use suitable identity to find the following products: (2x-7y) (2x+8y)

Answer 1

Hey there, this is the answer.

(2x - 7y) (2x + 8y) ⇒ Identity used - (x+a)(x+b) = (x² + x(a+b) + ab)

= (2x)² + 2x (-7y + 8y) + (-7y × 8y)

= 4x² + 2x (y) + (-56y²)

= 4x² + 2xy - 56y²   ⇒⇒  Answer.