Question

Evaluvate (2a-7)(2a-7) using appropriate identity

Answer 1

Answer:

${(2a - 7)}^{2}$

$(a - b)^{2} = {a}^{2} + {b}^{2} - 2 \times a \times b$

${2a}^{2} + {7}^{2} - 2 \times 2a \times 7$

$= {4a}^{2} + 49 - 28a$

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