Question

Evalute (5+2b) (5-2b )

Answer 1

Step-by-step explanation:

(5+2b) (5-2b)

= 5(5-2b) - 2b(5 - 2b)

= 25 - 10b - 10b + $2b^{2}$

= 25 + $4b^{2}$

Answer 2

Step-by-step explanation:

using (a+b)(a-b)= a^2- b^2

Therefore, let 5 be 'a' and 2b be 'b'

(5+2b)(5-2b)= 5^2- (2b)^2

=25- 4b^2

I hope it helps