SOLUTION: I am a college student returning to classes after a 3 year break. I sure have forgotten a ton in the past three years! Here is my latest problem: How do I solve for X in this eq

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: I am a college student returning to classes after a 3 year break. I sure have forgotten a ton in the past three years! Here is my latest problem: How do I solve for X in this eq      Log On


   

Question 2805: I am a college student returning to classes after a 3 year break. I sure have forgotten a ton in the past three years! Here is my latest problem: How do I solve for X in this equation? Please show me the steps so I can repeat this type of problem. I feel so dunce! Thanks!
100X-4000/100X=.3
Answer by kiru_khandelwal(79) About Me  (Show Source):
You can put this solution on YOUR website!
100x - 4000/100x = .3
=> (100x*100x - 4000)/100x = 3/10
=> 10000x^2 -4000 = 30x
1000x^2 -400 = 3x
1000x^2 -3x - 400 =0
Now u can find the roots of the equation by using the formulae
x = %28-b%2B-sqrt%28b%2Ab-4%2Aa%2Ac%29%2F%282%2Aa%29%29