Question 436748
A cube has a surface area of 6x^2+24x+24 Find the length of a side. 
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Total surface = 6*area of one of the square faces
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Divide both sides by 6
x^2+4x+4 = area of one of the square faces
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factor:
(x+2)^2 = side^2
side = x+2

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Cheers,
Stan H.