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How do you factor #2a^3-128#?

1 Answer

Jul 4, 2016

#(a - 4)(a^2 + 4a + 16)#

Explanation:

Apply the algebraic formula:
#a^3 - b^3 = (a - b) (a^2 + ab + b^2)#
#y = 2(a^3 - 64) = 2(a^3 - 4^3) = 2(a - 4)(a^2 + 4a + 16)#

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