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Old 09-16-2010   #2
Mr. Hui


 
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If LM=x^2, MN=x, and LN=12, then

x^2 + x = 12

Manipulative into quadratic form.

x^2 + x - 12 = 0

Factor products of trinomal.

(x + 4) (x - 3) = 0

Solve.

x = -4 or x = 3

Eliminate negative length.

x = 3
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