Seudónimo
Seudónimo
06-10-2014
Mathematics
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Factor completely 2x3 + x2 - 18x – 9
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06-10-2014
[tex]2x^3+x^2-18x-9=x^2(2x+1)-9(2x+1)=(x^2-9)(2x+1)=\\=(x-3)(x+3)(2x+1)[/tex]
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