You can expand the first expression in parentheses, then add or subtract like terms.
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5xcubed
It is: 2xsquared+14x-9
4X2+X3+3X+7Y+2X3 can only be simplified to 3X3+4X2+3X+7Y, because X3 and 2X3 are the only like terms.
This may be copied wrong, but as written that equals 4x^2-15x which factors to x(4x - 15)
4x2 - 20x + 16 = 4(x2 - 5x + 4) = 4(x - 1)(x - 4)