# Solving the Equation 135=w(w+12): What are the Best Methods?

• venger

#### venger

I have this equation. 135=w(w+12)
Would random plugging in numbers into w effective? If not, please help me out... I know how to get to the answer i just need a better grasp on methods

This is a volume equation from your other post and it is not quite correct yet. Once you get the equation correct, I can help you solve it.

I have this equation. 135=w(w+12)
Would random plugging in numbers into w effective? If not, please help me out... I know how to get to the answer i just need a better grasp on methods

You mean, you need to solve for w? In that case, do you know how to find the roots of a quadratic equation?

here i go...
w^2+12W-135= 0
then blah blah blah quadratic formula.

Your equation is not correct; it should be a cubic. The method I suggested to you regarding a different cubic equation was not simply "randomly substitute numbers." You make an educated guess as to what the value of w could be (note, it must be a factor of 135) and then see if it solves the equation.

Wait a minute this all can be cleared by one question. Is it possible to do a quadratic formula in a cubic equation? I know I am not at my full brain capacity today...

Wait a minute this all can be cleared by one question. Is it possible to do a quadratic formula in a cubic equation? I know I am not at my full brain capacity today...

Is a cubic equation a quadratic equation?
Thus, can we use the quadratic equation to solve it?