Question

Using the identity , find the following...
1. (5p-7q) (5p-7q)
{Don't send irrelevant answers
Warning : it would be reported..}​

Answer 1

Answer:

(5p-7q)(5p-7q)

(5p-7q)²

we know that (a-b)²=a²+b²-2ab

so,(5p-7q)²=(5p)²+(7q)²-2(5p)(7q)

=25p²+49q²-70pq