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X^3-x.. get their similarities which is x then divide x to x^3 and to x.. just copy the sign.
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is that connected or your asking me to answer that two?
always remember to get first their similarities first then divide it..
2x^4-162 .. get their similarities which is 2 then divede 2 to 2^4 and to 162.. 2(x^4-81)
(x^2-1) = (x+1)(x-1)
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