simplify (x+3)^3+(x-3)^3
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( x + 3 )^3 + ( x - 3 )^3
= x^3 + 9x^2 + 27x + 27 + x^3 - 9x^2 + 27x - 27
= x^3 + x^3 + 27x + 27x
= 2x^3 + 54 x
= 2x ( x^2 + 27 )
= x^3 + 9x^2 + 27x + 27 + x^3 - 9x^2 + 27x - 27
= x^3 + x^3 + 27x + 27x
= 2x^3 + 54 x
= 2x ( x^2 + 27 )
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