22-09-2015
Mathematics

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(9r³ + 5r² + 11r) + (-2r³ + 9r - 8r²)

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22-09-2015

[tex]9r^3 - 2r^3 + 5r^2 - 8r^2 + 11r + 9r = 7r^3-3r^2 +20r[/tex]

[tex]7r^3-3r^2 +20r = r(7r^2 -3r +20)[/tex]

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