SOLUTION: This question deals with solving the quadratic equation by using the quadratic formula. The question is x^2=18-7X. I know the formula is ax^2+bx+c=0, A does not equal 0. I've lo

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: This question deals with solving the quadratic equation by using the quadratic formula. The question is x^2=18-7X. I know the formula is ax^2+bx+c=0, A does not equal 0. I've lo      Log On


   

Question 278733: This question deals with solving the quadratic equation by using the quadratic formula. The question is x^2=18-7X. I know the formula is ax^2+bx+c=0, A does not equal 0. I've looked at the formula, but have no idea how exactly to use it. ANy help would be much appreciated. Thanks.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
ax^2+bx+c=0 is the general form of a quadratic equation

the quadratic "formula" is derived by using the "completing the square" technique on the general equation

x = [-b ± sqrt(b^2 - 4ac)] / (2a)

put the equation in general form (equal to zero) and then plug the resulting values for a, b, and c into the formula