Question 353192
The area of a rectangle is,
{{{A=L*W}}}
The perimeter of a rectangle is,
{{{P=2L+2W}}}
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.
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You also know that,
{{{L=n+6}}}
{{{W=n}}}
Substitute,
{{{highlight(A=(n+6)n=n^2+6n)}}}
I'll leave you to finish the perimeter by subsituting just like I did in the area equation.
Substitute and simplify.