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x^{2}+7x+2-2-x+1
Combine 4x and 3x to get 7x.
x^{2}+7x-x+1
Subtract 2 from 2 to get 0.
x^{2}+6x+1
Combine 7x and -x to get 6x.
factor(x^{2}+7x+2-2-x+1)
Combine 4x and 3x to get 7x.
factor(x^{2}+7x-x+1)
Subtract 2 from 2 to get 0.
factor(x^{2}+6x+1)
Combine 7x and -x to get 6x.
x^{2}+6x+1=0
Quadratic polynomial can be factored using the transformation ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), where x_{1} and x_{2} are the solutions of the quadratic equation ax^{2}+bx+c=0.
x=\frac{-6±\sqrt{6^{2}-4}}{2}
All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.
x=\frac{-6±\sqrt{36-4}}{2}
Square 6.
x=\frac{-6±\sqrt{32}}{2}
Add 36 to -4.
x=\frac{-6±4\sqrt{2}}{2}
Take the square root of 32.
x=\frac{4\sqrt{2}-6}{2}
Now solve the equation x=\frac{-6±4\sqrt{2}}{2} when ± is plus. Add -6 to 4\sqrt{2}.
x=2\sqrt{2}-3
Divide -6+4\sqrt{2} by 2.
x=\frac{-4\sqrt{2}-6}{2}
Now solve the equation x=\frac{-6±4\sqrt{2}}{2} when ± is minus. Subtract 4\sqrt{2} from -6.
x=-2\sqrt{2}-3
Divide -6-4\sqrt{2} by 2.
x^{2}+6x+1=\left(x-\left(2\sqrt{2}-3\right)\right)\left(x-\left(-2\sqrt{2}-3\right)\right)
Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute -3+2\sqrt{2} for x_{1} and -3-2\sqrt{2} for x_{2}.