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n\left(-6-n\right)
Factor out n.
-n^{2}-6n=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.
n=\frac{-\left(-6\right)±\sqrt{\left(-6\right)^{2}}}{2\left(-1\right)}
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.
n=\frac{-\left(-6\right)±6}{2\left(-1\right)}
Take the square root of \left(-6\right)^{2}.
n=\frac{6±6}{2\left(-1\right)}
The opposite of -6 is 6.
n=\frac{6±6}{-2}
Multiply 2 times -1.
n=\frac{12}{-2}
Now solve the equation n=\frac{6±6}{-2} when ± is plus. Add 6 to 6.
n=-6
Divide 12 by -2.
n=\frac{0}{-2}
Now solve the equation n=\frac{6±6}{-2} when ± is minus. Subtract 6 from 6.
n=0
Divide 0 by -2.
-n^{2}-6n=-\left(n-\left(-6\right)\right)n
Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute -6 for x_{1} and 0 for x_{2}.
-n^{2}-6n=-\left(n+6\right)n
Simplify all the expressions of the form p-\left(-q\right) to p+q.