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12-05-2016
Mathematics

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simplify (3r^2+4) (2r-1).-8r^3+6r^2

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apologiabiology apologiabiology

12-05-2016

first simpliify
(3r^2+4)(2r-1)=
(3r^2+4)(2r)+(3r^2+4)(-1)=
(6r^3+8r)+(-3r^2-4)=
6r^3+8r-3r^2-4=
put back

6r^3-3r^2+8r-4-8r^3+6r^2=
-2r^3+3r^2+8r-4

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