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I’m not firmiliar with the sun or difference of cubes (HW assignment)

I’m not firmiliar with the sun or difference of cubes (HW assignment)-example-1
User Roloenusa
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1 Answer

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Given:


125r^3-216

Find-: Factor using the formula of the sum or difference of cube.

Sol:

Factoring sum and differences of cubs is:


\begin{gathered} x^3-y^3=(x-y)(x^2+y^2+xy) \\ \\ x^3+y^3=(x+y)(x^2+y^2-xy) \end{gathered}

Apply for the given information.


\begin{gathered} =125r^3-216 \\ \\ =(5r)^3-(6)^3 \end{gathered}
\begin{gathered} x^3-y^3=(x-y)(x^2+y^2+xy) \\ \\ (5r)^3-(6)^3=(5r-6)((5r)^2+(6)^2+(5r)(6)) \\ \\ =(5r-6)(25r^2+36+30r) \end{gathered}

User Markus Madeja
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