SOLUTION: I need help I have solve this quadratic equation, and I want to know if its right is there a way to check? {{{2x^2-4x-3=0}}}...my answer is x=1+

SOLUTION: I need help I have solve this quadratic equation, and I want to know if its right is there a way to check? {{{2x^2-4x-3=0}}}...my answer is x=1+ - 2sqrt(5). thank you.

Question 426848: I need help I have solve this quadratic equation, and I want to know if its right is there a way to check?
...my answer is x=1+ - 2sqrt(5).
thank you.
Found 2 solutions by stanbon, robertb:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
2x^2-4x-3=0
---
x = [4 +- sqrt(16-4*2*-3)]/4
---
x = [4 +- sqrt(40)]/4
---
x = [1 +- (1/2)sqrt(10)]
=============================
Cheers,
Stan H.
===========
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Divide both sides of the equation by 2, to get . For complex or radical roots, the conjugate must also be a root. The conjugate of the root that you got is .
The sum of the roots must be equal to -(-2), or 2. This is true, as .
The product of the roots must be -3/2. This is not true, as .
Hence the root that you got is incorrect.

RELATED QUESTIONS
Hello, I just want to doublecheck my answers if someone can help me. Solve the... (answered by jim_thompson5910,Alan3354,edjones)
Hi, So I missed my Pre-Ap Algebra II class, and I was wondering how I would be able to... (answered by josgarithmetic,MathTherapy)
I am hoping you can help me with this one, I think I got the right answer, but my grade... (answered by jim_thompson5910)
I have the whole quadratic equation, just want to make sure that I am plugging in the... (answered by Earlsdon,funmath)
Helen took the bus on her way to school and ran the rest of the way. She ran 3 mins.... (answered by stanbon,ptaylor)
Hello, I need to solve this equation. If there is no solution I have to say so. 5/4x + (answered by stanbon)
I am trying to solve an equation with fractions. This is the problem 2x over x^2+6x+8 (answered by stanbon)
Multiply. (4x-5)(x^2-4x+8) I want to check and see if I did it right. If I didn't do it (answered by jim_thompson5910)
2.)Why do we have to check the solutions when we solve radical equations? 4.)... (answered by edjones)