Question

expand (2a - 4b+7)(2a+4b+7)​

Answer 1

Step-by-step explanation:

(2a-4b+7)(2a+4b+7)

[(2a+7) - 4b][ (2a+7) + 4b]

so using a2-b2

we get

(2a+7)^2 - (4b)^2

Answer 2

Answer:

4a²+28a+49-16b²

Step-by-step explanation:

(2a - 4b+7)(2a+4b+7)​

(2a+7)²-(4b)²   [using a²-b²= (a+b)(a-b)]

[(2a)²+2(2a)(7)+(7)²] -16b²   [using (a+b)²=a²+2ab+b²]

4a²+28a+49-16b²

hope it helps you..