SOLUTION: 9) Solve. Round results to the nearest thousandth. 7x2 - 6x - .4255 = 0

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: 9) Solve. Round results to the nearest thousandth. 7x2 - 6x - .4255 = 0       Log On


   

Question 156881: 9) Solve. Round results to the nearest thousandth.
7x2 - 6x - .4255 = 0
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
7x2 - 6x - .4255 = 0
Using the quadratic equation:x=%28-b%2B-sqrt%28b%5E2-4%2Aa%2Ac%29%29%2F%282%2Aa%29 WE get;
x=(6+-sqrt[-6^2-4*7*-.4255])/2*7
x=(6+-sqrt[36+11.914])/14
x=(6+-sqrt47.914)/14
x=(6+-6.922)/14
x=12.922/14
x=.923 answer.
x=(6-6.922)/14
x=-.922/14
x=-.066 answer.