Question

EXPAND THIS = (71k + 36n - 42k)²
FAST........

Answer 1

$\huge{heya buddy}$

$<i><u><b>$
(71k + 36n - 42k)²

collect like terms

$\huge{(71k-42k+36n)^2}$

$\huge{(29k+36n)^2}$

Now using (a+b)^2

$\huge{(29k)^2+2(29k)(36n)+36n^2}$

$\huge{841k^2+2088kn+1296n^2}$