Question

use identities
to find their product
(2x+5)^2-(2x-5)^2​

Answer 1

Answer:

(2x+5)²-(2x-5)²

Identity:- a²-b²=(a+b) (a-b)

a=(2x-5)

b=(2x-+5)

So..(2x+5)²-(2x-5)²

[2x+5-(2x-5)]

(2x+5-2x-5)

10×4x

40x

Answer is..40x