To simplify x3-9x, you factor out the x, leaving you with x(x2-9). You can then take the square root of both numbers and end up with x(x+3)(x-3).
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2 - 8x - x + 4 Combine numeric terms: -8x - x + 6 Combine x terms: -9x + 6 or 6 - 9x If you want, pull out common terms: 3(-3x + 2) or -3(3x - 2)
The GCF is x.
x times x times x equals x cubed
x2+9x-36 = (x-3)(x+12) when factored
factor out a 3x 3x(x-3)=3x2-9x