SOLUTION: I asked this problem earlier, but have learned how to type it so that it is easier for you to read and understand. I need to square this problem. Problem: 2x^2+4x-1=0 Formula I u

Question 288296: I asked this problem earlier, but have learned how to type it so that it is easier for you to read and understand. I need to square this problem.
Problem: 2x^2+4x-1=0
Formula I used was:
I got:

then
then
then (this is supposed to read "+ or - 2" not -2)
then (this is supposed to read "+ or - 2", not -2)
then after simplifying, I get

My book says the answer is:
I can't figure out where I went wrong, so I can't answer my real question of 2x^2+10x-3=0.
Any help is appreciated!! Thank you!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Problem: 2x^2+4x-1=0
Formula I used was:
I got:

then
then
then (this is supposed to read "+ or - 2" not -2)
then (this is supposed to read "+ or - 2", not -2)
then after simplifying, I get

My book says the answer is:
I can't figure out where I went wrong, so I can't answer my real question of 2x^2+10x-3=0.
Any help is appreciated!! Thank you!
------------
You did fine until the last step:
(-4+-2sqrt(6))/(4)
There is a common factor of 2 in the numerator
and in the denominator.
Remove it and cancel it and you get:
(-2+sqrt(6))/2
======================
Cheers,
Stan H.

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