Final answer to the problem
$x^2-14x+49$
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Step-by-step Solution
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1
Apply the formula: $\left(a+b\right)^2$$=a^2+2ab+b^2$, where $a=x$, $b=-7$ and $a+b=x-7$
$x^2-14x+49$
Final answer to the problem
$x^2-14x+49$
