SOLUTION: directions: use quadratic equation x=-b+(rad)(b^2-4ac)/2a to find theroots of the equation x^2-3x+2=0.(the plus sign by the b has a line under it). i can have one of four answers.

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: directions: use quadratic equation x=-b+(rad)(b^2-4ac)/2a to find theroots of the equation x^2-3x+2=0.(the plus sign by the b has a line under it). i can have one of four answers.       Log On


   

Question 124344: directions: use quadratic equation x=-b+(rad)(b^2-4ac)/2a to find theroots of the equation x^2-3x+2=0.(the plus sign by the b has a line under it). i can have one of four answers. A)2 B)2,1 C)-1,-2 D)1,1 1/2. which one is correct?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
directions: use quadratic equation x=-b+(rad)(b^2-4ac)/2a to find theroots of the equation x^2-3x+2=0
:
The quadratic equation:
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
In your problem a=1; b=-3; c=2
x+=+%28-%28-3%29+%2B-+sqrt%28-3%5E2+-+4+%2A+1+%2A+2+%29%29%2F%282%2A1%29+
;
x+=+%283+%2B+sqrt%289+-+8+%29%29%2F2+
x+=+%283+%2B+sqrt%281%29%29%2F2
x+=+%283+%2B+1%29%2F2
x+=+4%2F2
x = 2
and
x+=+%283+-+sqrt%289+-+8+%29%29%2F%282%29+
x+=+%283+-+sqrt%281%29%29%2F2
x+=+%283+-+1%29%2F2
x+=+2%2F2
x = 1
:
The solutions are x = 2 and x = 1
I am sorry, I should not have assumed it was easy for you.