Question

please solve this question​

Answer 1

$\sf \: 9 {m}^{2} + 30mn + 25 {n}^{2} \\ \sf \implies \: (3 {m})^{2} + 30mn + (5 {n})^{2} \\ \sf \implies \: ((3 {m})^{2} + (5 {n})^{2} ) + 30mn \\ \gray{ \sf \: {(a + b})^{2} = {a}^{2} + {b}^{2} + 2ab } \\ \red{\sf \implies (3m + 5n)....(ans)}$