Question

expand :(4p-5q)^2 , (x+8) (x-11),(3a+7b) (3a-7b)

Answer 1

${(4p - 5q)}^{2} \\ \\ = {(4p)}^{2} - 2 \times 4p \times 5q {(5q)}^{2} \\ \\ 16 {p}^{2} - 40pq + 25 {q}^{2}$

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