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Nady [450]
3 years ago
12

Factor completely 2x3 + x2 - 18x – 9.

Mathematics
2 answers:
olya-2409 [2.1K]3 years ago
7 0
2x^3 + x^2 - 18x - 9=x^2(2x+1)-9(2x+1)=\\ \\=(2x+1)(x^2-9)=(2x+1)(x-3)(x+3)


lys-0071 [83]3 years ago
6 0
2x^3+x^2-18x-9=x^2(2x+1)-9(2x+1)\\\\=(2x+1)(x^2-9)=(2x+1)(x^2-3^2)\\\\=(2x+1)(x-3)(x+3)
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