Completing the square? Easy algebra plz help!
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Completing the square? Easy algebra plz help!

[From: ] [author: ] [Date: 13-03-05] [Hit: ]
......
the base of a parallelogram I 8 inches longer than twice the height. the area of the parallelogram is 64 square inches. what is the height? 

The answer is 4 inches but how to you get that? Please show work!

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h(2h+8) = 64
2h^2+8h-64 = 0
h^2+4h-32 = 0
(h+8)(h-4) = 0
h = 4 inches
1
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