Question

Factorise 4(m+n)²-28p(m+n)+49p²

Answer 1

4(m+n)² - 28p(m+n) + 49p²

= {2(m+n)}² - 2{2(m+n)}{7p} + {7p}²

= { 2(m+n) - 7p }²

= { 2(m+n) - 7p } {2(m+n) - 7p}