Question

Use a suitable identity to get each of the following product. 1 +2+2=5 (2a – 7) (2a – 7 )​

Answer 1

Answer:

$(2a - 7)(2a - 7) = {(2a - 7)}^{2} \\ = {2a}^{2} + {7}^{2} - 2 \times 2a \times 7 \\ = 4 {a}^{2} + 49 - 28a$