SOLUTION: solve the equation using the quadratic formula. (9x-1)(2x+1)=2x What is the solution set?

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: solve the equation using the quadratic formula. (9x-1)(2x+1)=2x What is the solution set?      Log On


   

Question 647203: solve the equation using the quadratic formula.
(9x-1)(2x+1)=2x
What is the solution set?
Answer by colliefan(242) About Me  (Show Source):
You can put this solution on YOUR website!
You must first get it into the form:
ax^2+bx+c=0
Then, for ax2 + bx + c = 0, the value of x is given by:
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

So:
(9x-1)(2x+1)=2x
18x^2+7x-1=2x
18x^2+5x-1=0
Then substitute a, b and c into the quadratic formula:

x+=+%28-5+%2B-+sqrt%28+5%5E2-4%2A18%2A-1+%29%29%2F%282%2A18%29+