a, \(x^4-2x^3-2x^2-2x-3\)
=\(\left(x^4-2x^3\right)-\left(2x^2+2x\right)-3\)
= \(x^3\left(x-2\right)-2x\left(x+1\right)-3\)
= \(x^3\left(x-2\right)-2x\left(x+1-3\right)\)
= \(x^3\left(x-2\right)-2x\left(x-2\right)\)= \(\left(x-2\right)\left(x^3-2x\right)\)
b, \(x^4+3x^3-7x^2-27x-18\)
= \(\left(x^4+3x^3\right)-\left(7x^2+27x\right)-18\)
= \(x^3\left(x+3\right)-7x\left(x+3\right)-18\)
= \(\left(x+3\right)\left(x^3-7x-18\right)\)
đúng thì tick nha bn:)):
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