Question

Evaluate each of the following using appropriate identites: (4l+5m)²​

Answer 1

${a}^{2} + {b}^{2} + 2 \times a \times b = (4 {l})^{2} + (5 {m})^{2} + 2 \times 4l + 5m = 16 {l}^{2} + 25 {m }^{2} + 40lm$