Question

Find the expansion of the following:
$(6-4a-7b{)}^2$

Answer 1

$(6-4a-7b{)}^2$
Let us simplify the expression, we get
$(6-4a-7b{)}^2=[6+(-4a)+(-7b){]}^2$
$=(6{)}^2+(-4a{)}^2+(-7b{)}^2+2(6\left)\right(-4a)+2(-4a\left)\right(-7b)+2(-7b\left)\right(6)$
$=36+16a^2+49b^2-48a+56ab-84b$