Answer
$49x^{2}-14x+1$
Work Step by Step
Step 1: Using the special product,
$(7x-1)^{2}=(7x)^{2}+2(7x)(-1)+(1)^{2}$
Step 2: $(7x)^{2}+2(7x)(-1)+(1)^{2}=49x^{2}-14x+1$
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