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posted by mema on Sunday, May 22, 2011 at 12:51am.
add the following (8.1x^2-5.9x-7.1)+-9.8x^2-8.1x-4.8)
(8.1x^2-5.9x-7.1)+(-9.8x^2-8.1x-4.8)= 8.1x^2+(-9.8x^2) -5.9x+(-8.1x) -7.1+(-4.8)= 8.1x^2-9.8x^2 -5.9x-8.1x -7.1-4.8= -1.71x^2 -14x -11.9
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