How do you solve #3x^2 = -9x# by factoring?
The answer is:
Let's do this in steps
First, move all instances of "x" to one side of the equation.
Next, factor out common coefficients 3.
By factoring (as you requested), factor out x from the parentheses.
At this step, you will be able to find both answers (as this is a quadratic equation).