SOLUTION: So, I need help getting walked through the steps of the quadratic equation. If a=1 , b=2.2 x10^-2 and c=-1.2 x10^-4, how does x= 4.5x10^-3? I got as far as -2.2x10^2 + or - squa

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: So, I need help getting walked through the steps of the quadratic equation. If a=1 , b=2.2 x10^-2 and c=-1.2 x10^-4, how does x= 4.5x10^-3? I got as far as -2.2x10^2 + or - squa      Log On


   

Question 840469: So, I need help getting walked through the steps of the quadratic equation. If a=1 , b=2.2 x10^-2 and c=-1.2 x10^-4, how does x= 4.5x10^-3?
I got as far as -2.2x10^2 + or - square root of 9.64x10^-4 and then don't know what to do or if it is right. PLEASE HELP!! I need to get comfortable with the quadratic equation. Thank you!
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
You have the values for a, b, and c, and you have these from a quadratic equation based on general form ax%5E2%2Bbx%2Bc=0;
just use the values in the general solution. Simplify and compute! What is the result?





x=%28-2.2%2A10%5E%28-2%29%2B-+%2810%5E%28-2%29%29sqrt%289.64%29%29%2F%282%29
x=%28-2.2%2A10%5E%28-2%29%2B-+%2810%5E%28-2%29%293.1048%29%2F%282%29


x=%28-2.2%2A10%5E%28-2%29%2B-+3.1048%2A10%5E%28-2%29%29%2F2

x=%28-2.2%2A10%5E%28-2%29%2B-+3.1048%2A10%5E%28-2%29%29%2F2
x=%28-5.3%2A10%5E%28-2%29%29%2F2 OR x=%280.90%2A10%5E%28-2%29%29%2F2
x=-2.7%2A10%5E%28-2%29 OR x=0.45%2A10%5E%28-2%29
highlight%28x=-2.7%2A10%5E%28-2%29%29 OR highlight%28x=4.5%2A10%5E%28-3%29%29