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December 20, 2014

December 20, 2014

Posted by **Aniya** on Sunday, July 13, 2008 at 4:59pm.

x(x+3)......x^2+3x

21(x^2+3x)....

21x^2+63x-2730.....

I am stuck.....I think I am doing it wrong. I have the answers but I dont know how to get there....Help!

- Math -
**drwls**, Sunday, July 13, 2008 at 5:17pmLet x be the width. x = 3 is then the height.

21 x*(x+3) = 2730

x(x+3) = 130

x^2 +3x -130 = 0

(x-10)(x+13) = 0

The only meaningful root is x = 10.

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