SOLUTION: {{{(5x+4)^3-343}}}

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Question 294947: %285x%2B4%29%5E3-343
Answer by helpnalgebra(91) About Me  (Show Source):
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(5x+4)^(3)-343
(5x+4)(5x+4)(5x+4)-343
(5x*5x+5x*4+4*5x+4*4)(5x+4)-343
(25x^(2)+40x+16)(5x+4)-343
(25x^(2)*5x+25x^(2)*4+40x*5x+40x*4+16*5x+16*4)-343
(125x^(3)+300x^(2)+240x+64)-343

125x^(3)+300x^(2)+240x-279 answer