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p\left(p+9\right)
Factor out p.
p^{2}+9p=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.
p=\frac{-9±\sqrt{9^{2}}}{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.
p=\frac{-9±9}{2}
Take the square root of 9^{2}.
p=\frac{0}{2}
Now solve the equation p=\frac{-9±9}{2} when ± is plus. Add -9 to 9.
p=0
Divide 0 by 2.
p=-\frac{18}{2}
Now solve the equation p=\frac{-9±9}{2} when ± is minus. Subtract 9 from -9.
p=-9
Divide -18 by 2.
p^{2}+9p=p\left(p-\left(-9\right)\right)
Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute 0 for x_{1} and -9 for x_{2}.
p^{2}+9p=p\left(p+9\right)
Simplify all the expressions of the form p-\left(-q\right) to p+q.