Question 3(i)
Find the following squares by using identities:
$(b - 7)^{2}$

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Solution

$(b - 7)^{2} = (b)^{2} - 2 \times b \times 7 + (7)^{2}$
$[U s i n g i d e n t i t y (a - b)^{2} = a^{2} - 2 a b + b^{2}]$
$= b^{2} - 14 b + 49$

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