SOLUTION: Solve using the quadratic formula. g(x)=2x^2-6x-1 Thanks! show work please.

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Solve using the quadratic formula. g(x)=2x^2-6x-1 Thanks! show work please.      Log On


   

Question 1000983: Solve using the quadratic formula.
g(x)=2x^2-6x-1
Thanks! show work please.
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

g%28x%29=2x%5E2-6x-1 =>a=2,b=-6,c=-1

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-%28-6%29+%2B-+sqrt%28+%28-6%29%5E2-4%2A2%2A%28-1%29+%29%29%2F%282%2A2%29+
x+=+%286+%2B-+sqrt%28+36%2B8+%29%29%2F4+
x+=+%286+%2B-+sqrt%28+44+%29%29%2F4+

x+=+%286+%2B-+sqrt%28+4%2A11+%29%29%2F4+
x+=+%28cross%286%293+%2B-+cross%282%29sqrt%28+11+%29%29%2Fcross%284%292+
x+=+%283+%2B-+sqrt%28+11+%29%29%2F2+
exact solutions:
x+=+%283+%2B+sqrt%28+11+%29%29%2F2+
or
x+=+%283+-+sqrt%28+11+%29%29%2F2+
approximate solutions:
x+=+3.16+
or
x+=+-0.16+

+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+2x%5E2-6x-1%29+