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OpenStudy (anonymous):
The volume of a rectangular prism is equal to x3 + 4x2 + 3x. What is the longest edge of the prism? x + 1 x + 3 4x x3
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Directrix (directrix):
x3 + 4x2 + 3x = l*w*h x*(x^2 + 4x + 3) = l*w*h x* ( x + 3) * (x + 1) = l*w*h x has to be positive --> x + 3 is the longest edge
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