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a\left(1+3a\right)
Factor out a.
3a^{2}+a=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.
a=\frac{-1±\sqrt{1^{2}}}{2\times 3}
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.
a=\frac{-1±1}{2\times 3}
Take the square root of 1^{2}.
a=\frac{-1±1}{6}
Multiply 2 times 3.
a=\frac{0}{6}
Now solve the equation a=\frac{-1±1}{6} when ± is plus. Add -1 to 1.
a=0
Divide 0 by 6.
a=-\frac{2}{6}
Now solve the equation a=\frac{-1±1}{6} when ± is minus. Subtract 1 from -1.
a=-\frac{1}{3}
Reduce the fraction \frac{-2}{6} to lowest terms by extracting and canceling out 2.
3a^{2}+a=3a\left(a-\left(-\frac{1}{3}\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 -\frac{1}{3} for x_{2}.
3a^{2}+a=3a\left(a+\frac{1}{3}\right)
Simplify all the expressions of the form p-\left(-q\right) to p+q.
3a^{2}+a=3a\times \frac{3a+1}{3}
Add \frac{1}{3} to a by finding a common denominator and adding the numerators. Then reduce the fraction to lowest terms if possible.
3a^{2}+a=a\left(3a+1\right)
Cancel out 3, the greatest common factor in 3 and 3.