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OpenStudy (anonymous):
a square has an area of 16x^2+40x+25.find the length of a side
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OpenStudy (anonymous):
If 16x^2+40x+25 is a perfect square, then 4x + 5 is a factor. check it? yup, it works, because 4x*5*2 gives the middle term. so area comes from side length squared, and the square root pf it is 4x+5, so the side length is 4x+5
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