Question

. Why is the middle term 2ab in (a + b)2 and −2ab in (a − b)2 when written in standard form?

Answer 1

Answer:

(a+b)²= a²+b²+2ab

(a-b)²= a²+b²-2ab

Step-by-step explanation:

=(a+b)²

=(a+b)(a+b)

=a²+ab+ba+b²

=a²+b²+2ab

=(a-b)²

=(a-b)(a-b)

=a²-ab-ba+b²

=a²+b²-2ab