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(21E+) Completing the Square $x^2+bx+c\rightarrow \left(x-h\right)^2+k$

Now we will convert $f(x)=x^2+6x+7$ to the form $f(x)=\left(x-h\right)^2+k$.

$f(x)=x^2+6x+7$

$f(x)=x^2+6x\phantom{++|}+7$

$f(x)=x^2+6x+$