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22-05-2016
Mathematics

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Simplify the sum 4/m+9 + 5/m2 - 81

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apologiabiology apologiabiology

22-05-2016

factor
m^2-81=(m-9)(m+9)
multiply other equation by (m-9)/(m-9)

4(m-9)/(m^2-81)+5/(m^2-81)
(4(m-9)+5)/(m^2-81)
(4m-36+5)/(m^2-81)
(4m-31)/(m^2-81)

Answer Link

18-06-2018

The answer to the question is 4m-31/(m-9)(m+9)

Answer Link

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