SOLUTION: 3x²-4x-8=-6

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: 3x²-4x-8=-6       Log On


   

Question 1112020: 3x²-4x-8=-6

Found 2 solutions by Boreal, addingup:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
3x²-4x-8=-6
3x^2-4x-2=0
x=(1/6)(4+/- sqrt (16+24)); sqrt (40)=2 sqrt(10)
x=(1/3)(2+/- sqrt (10))
graph%28300%2C300%2C-10%2C10%2C-10%2C10%2C3x%5E2-4x-2%29

Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
3x^2 - 4x - 8 = -6
I'll use the quadratic formula:
3x^2 -4x - 2 = 0
now we've got the equation in standard form ax^2 + bx + c = 0 so we can go ahead and use the quadratic formula (-b +- sqrt(b^2 - 4ac)/2a:
x = (-(-4) + sqrt((-4)^2 - 4*(3(-2))/2*3
x = (4 + sqrt(16 + 24))/2*3
x = (4 + sqrt(40))/6
x = (4 + 6.325)/6 = 1.72