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6\left(a^{2}-2a\right)
Factor out 6.
a\left(a-2\right)
Consider a^{2}-2a. Factor out a.
6a\left(a-2\right)
Rewrite the complete factored expression.
6a^{2}-12a=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{-\left(-12\right)±\sqrt{\left(-12\right)^{2}}}{2\times 6}
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{-\left(-12\right)±12}{2\times 6}
Take the square root of \left(-12\right)^{2}.
a=\frac{12±12}{2\times 6}
The opposite of -12 is 12.
a=\frac{12±12}{12}
Multiply 2 times 6.
a=\frac{24}{12}
Now solve the equation a=\frac{12±12}{12} when ± is plus. Add 12 to 12.
a=2
Divide 24 by 12.
a=\frac{0}{12}
Now solve the equation a=\frac{12±12}{12} when ± is minus. Subtract 12 from 12.
a=0
Divide 0 by 12.
6a^{2}-12a=6\left(a-2\right)a
Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute 2 for x_{1} and 0 for x_{2}.