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X^4-2X^3+2X-1
=(X^4-1)-(2X^3-2X)
=(X^2+1)(X^2-1)-2X(X^2-1)
=(X^2+1-2X)(X^2-1)
=(X-1)^2(X+1)(X-1)
=(X-1)^3(X+1)
=(X^4-1)-(2X^3-2X)
=(X^2+1)(X^2-1)-2X(X^2-1)
=(X^2+1-2X)(X^2-1)
=(X-1)^2(X+1)(X-1)
=(X-1)^3(X+1)
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f(x)=x^4-2x^3+2x-1
f(1)=1-2+2-1=0
f(-1)=1+2-2-1=0
x^4-2x^3+2x-1 =(x^2-1)(x^2+ax+1)
coef. of x
a=-2
x^4-2x^3+2x-1
=(x-1)(x+1)(x^2-2x+1)
=(x-1)(x+1)(x-1)^2
=(x-1)^3.(x+1)
f(1)=1-2+2-1=0
f(-1)=1+2-2-1=0
x^4-2x^3+2x-1 =(x^2-1)(x^2+ax+1)
coef. of x
a=-2
x^4-2x^3+2x-1
=(x-1)(x+1)(x^2-2x+1)
=(x-1)(x+1)(x-1)^2
=(x-1)^3.(x+1)
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