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Factor polynomial x^4+2*x^3-x^2-2*x+1

An expression to simplify:

The solution

You have entered [src]
 4      3    2          
x  + 2*x  - x  - 2*x + 1
$$\left(- 2 x + \left(- x^{2} + \left(x^{4} + 2 x^{3}\right)\right)\right) + 1$$
x^4 + 2*x^3 - x^2 - 2*x + 1
Factorization [src]
/          ___\ /          ___\
|    1   \/ 5 | |    1   \/ 5 |
|x + - - -----|*|x + - + -----|
\    2     2  / \    2     2  /
$$\left(x + \left(\frac{1}{2} - \frac{\sqrt{5}}{2}\right)\right) \left(x + \left(\frac{1}{2} + \frac{\sqrt{5}}{2}\right)\right)$$
(x + 1/2 - sqrt(5)/2)*(x + 1/2 + sqrt(5)/2)
General simplification [src]
     4    2            3
1 + x  - x  - 2*x + 2*x 
$$x^{4} + 2 x^{3} - x^{2} - 2 x + 1$$
1 + x^4 - x^2 - 2*x + 2*x^3
Assemble expression [src]
     4    2            3
1 + x  - x  - 2*x + 2*x 
$$x^{4} + 2 x^{3} - x^{2} - 2 x + 1$$
1 + x^4 - x^2 - 2*x + 2*x^3
Combining rational expressions [src]
1 + x*(-2 + x*(-1 + x*(2 + x)))
$$x \left(x \left(x \left(x + 2\right) - 1\right) - 2\right) + 1$$
1 + x*(-2 + x*(-1 + x*(2 + x)))
Numerical answer [src]
1.0 + x^4 - x^2 + 2.0*x^3 - 2.0*x
1.0 + x^4 - x^2 + 2.0*x^3 - 2.0*x
Combinatorics [src]
             2
/          2\ 
\-1 + x + x / 
$$\left(x^{2} + x - 1\right)^{2}$$
(-1 + x + x^2)^2
Common denominator [src]
     4    2            3
1 + x  - x  - 2*x + 2*x 
$$x^{4} + 2 x^{3} - x^{2} - 2 x + 1$$
1 + x^4 - x^2 - 2*x + 2*x^3
Trigonometric part [src]
     4    2            3
1 + x  - x  - 2*x + 2*x 
$$x^{4} + 2 x^{3} - x^{2} - 2 x + 1$$
1 + x^4 - x^2 - 2*x + 2*x^3
Powers [src]
     4    2            3
1 + x  - x  - 2*x + 2*x 
$$x^{4} + 2 x^{3} - x^{2} - 2 x + 1$$
1 + x^4 - x^2 - 2*x + 2*x^3
Rational denominator [src]
     4    2            3
1 + x  - x  - 2*x + 2*x 
$$x^{4} + 2 x^{3} - x^{2} - 2 x + 1$$
1 + x^4 - x^2 - 2*x + 2*x^3