Question

factorise this question

Answer 1

hope it's helpful for you

Answer 2

4(m+n)^2-28p (m+n)+49p^2

Let m+n= q

=4q^2-28pq+49p^2

=(2q)^2-2 (2q)(7p)+(7p)^2

=(2q-7p)^2

=[2 (m+n)-7p^2]