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If the area of a rectangle with length is 4x with an exponent of 2 plus 12x, what is the width???

If the area of a rectangle with length is 4x with an exponent of 2 plus 12x, what-example-1

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Length: 4x
Width: ??

Length x Width: 4x^2 + 12x
Can be rewritten as: 4x(x+3)

Therefore: ?? = x + 3
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