Question

(7a-5b)(7a-5b)solve by identity

Answer 1

Yups.
so
we can write
${(7a - 5b)}^{2}$
by opening this as we know
${(x - y)}^{2} = {x}^{2} + {y}^{2} + 2xy$
so we get ,
$49 {a}^{2} + 25 {b}^{2} - 70ab$
this the answer