SOLUTION: By what like amount does the length and width of a 6" by 4" rectangle need to be increased for it's area to be doubled

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Question 1192664: By what like amount does the length and width of a 6" by 4" rectangle need to be increased for it's area to be doubled




Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
By what like amount does the length and width of a 6" by 4" rectangle need to be increased for it's area to be doubled
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6*4 = 24
(6+x)*(4+x) = 48
x^2 + 10x + 24 = 48
x^2 + 10x - 24 = 0
(x+12)*(x-2) = 0
x = 2
---> 8 by 6
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PS it's = it is