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math- factoring

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factor completely

1) 8x^3 + 27y^3

2) u^3 + 125v^3

  • math- factoring -

    Note that
    1) 8x^3+27y^3 ≡ (2x)^3+(3y)^3
    and apply the following identity:
    a^3+b^3 = (a+b)(a^2-ab+b^2)
    hint: substitute a=2x, b=3y
    2) same strategy as the first.

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