Question

21k2+15k2-6k
$21 { k }^{2} + 15 {k}^{2} - 6k$

Answer 1

=21k^2+15k^2-6k
=36k^2-6k
=6k(6k-1)

Answer 2

Hey mate, here is your answer.
$21k {}^{2} + 15k {}^{2} - 6k$
$36k {}^{2} - 6k$
$6k(6k - 1)$
Hope this helped and please mark as brainliest :):)