Answer: x = 4
Explanation:
This is easy, just use the Area formula as A=lw and substitute the values.
A=x2+7x+12
L=(x+4)
W= x
A=L(w)
x2+7x+12 = (x+4)x
x2+7x+12= x2+4x
x2-x2+7x-4x=-12
3x=-12
x=-4
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