SOLUTION: the area of a painting is 15 square feet. find the dimensions of the painting if the height is 7 inches more than twice the width

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Question 520681: the area of a painting is 15 square feet. find the dimensions of the painting if the height is 7 inches more than twice the width
Answer by Math_prodigy(24) About Me  (Show Source):
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h=height
w=width
h*w=15
w=15/h
h=7+2w
h=7+2*(15/h)
h=7+30/h
h^2=7h+30
h^2-7h-30=0
h= x+=+%28-%28-7%29+%2B-+sqrt%28+%28-7%29%5E2-4%2A1%2A%28-30%29+%29%29%2F%282%2A1%29+
h=10
w=15/10=1.5