x2 + 18x = x(x + 18) which cannot be simplified further.
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That factors to (x - 3)(x + 6)
Since the problem has 4 terms, first you factor x cubed plus 9x squared, then you factor 2x plus 18. So when you factor the first two term, you would get x sqaured (x plus 9). Then when you factor the last two terms and you get 2 (x plus 9). Ypure final answer would be (x squared plus 2)(x plus 9)
x[x+1] squared Simplified is, to my knowledge, x squared plus ( x + 1) squared
2(x - 3)(x - 3)
(x, y) = (-3, -3) or (3, 3)