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(xy - 7)(x^2y^2 + 7xy + 49)
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x3y3 - 343 = (xy - 7)*(x2y2 + 7xy + 49)
343 = 7^3 343^3 = 7^9
343 cubed = 40,353,607
It is: 7 cubed = 343
7 cubed is equal to 343.
(4x + 7)(16x2 - 28x + 49)