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posted by bob on Monday, December 13, 2010 at 8:22pm.

20xsquared+40 x+15=0

factor out 5 u get 5(4x^2+8x +3) = 0 5(4x^2+2x+6x+3)=0 5(2x(2x+1)+3(2x+1))=0 5(2x+1)(2x+3)=0 x=-1/2 or x=-3/2

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