07-03-2017
Mathematics

contestada

The long side of a rectangle is 3x+21 units, and it's area is 3x^2+33x+84. Find the width

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amazingmaddi amazingmaddi

07-03-2017

l*w=area
(3x+21)*w=3x^2+33x+84
w=(3x^2+33x+84)/3x+21
(3(x+4)(x+7))/3(x+7)
w=x+4

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