Question

Simplify using a suitable identity: (2x+5)² –(2x–5)²​

Answer 1

Answer:

40x

Step-by-step explanation:

(2x+5)² – (2x–5)²

Using identity: a²- b² = (a+b)(a-b)

= (2x+5+(2x-5))(2x+5-(2x-5))

= (2x+5+2x-5)(2x+5-2x+5)

= (4x)(10)

= 40x