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(r-5) 3

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667

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(r-5)³

Guest Jul 4, 2016

1⁺⁰ Answers

+9675

+5

$(a-b)^3 = a^3-3a^2b+3ab^2-b^3$

Therefore $(r-5)^3=r^3-(3)(r^2)(5)+(3)(r)(5^2)-5^3=r^3-15r^2+75r-125$

MaxWong Jul 4, 2016

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