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Linear Equation in 2 Variables

Evaluate : ...

Question

Evaluate : $(b - 7)^{2}$

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Solution

$(b - 7)^{2} = b^{2} + 49 - 14 b = b^{2} - 14 b + 49 [∵ (x - y)^{2} = x^{2} + y^{2} - 2 x y]$

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