Finding the discriminant of 4x^2 - 4x + 6 = 0

[spicytakoyum]

How do I find the discriminant of :

4x^2 - 4x + 6 = 0 ?

I tried factoring and I don't think that works. I looked in my notes and tried to plug it into the b^2-4ac formula, but I'm not sure if I'm doing it right since I keep coming up with weird answers.

Thank you,
Mabel

 

[Mrspi]

Re: Finding the discriminant

How do I find the discriminant of :

4x^2-4x+6=0 ?

I tried factoring and I don't think that works. I looked in my notes and tried to plug it into the b^2-4ac formula, but I'm not sure if I'm doing it right since I keep coming up with weird answers.

Thank you,
Mabel

When you have a quadratic equation in the form

y = ax^2 + bx + c

the discriminant is b^2 - 4ac

I'm a bit confused by your problem....but I'd guess that you've got a = 4, b = -4, and c = 6.

Substitute those values into b^2 - 4ac, and see what you get. And what does that result tell you?

 

[spicytakoyum]

Re: Finding the discriminant

I plugged it in and got -112, but my answer choices are

a) 4 square root of 5 b) -4 square root of 5 c) -80 d) 80

So I'm stumped right now

 

[Mrspi]

Re: Finding the discriminant

I plugged it in and got -112, but my answer choices are

a) 4 square root of 5 b) -4 square root of 5 c) -80 d) 80

So I'm stumped right now

You had 4x^2 - 4x + 6 = 0

a = 4, b = -4, and c = 6

b^2 - 4ac = (-4)^2 - 4(4)(6)

b^2 - 4ac = 16 - 96

b^2 - 4ac = -80

Since you didn't post your EXACT question here, I am not sure what you were supposed to be doing.

I strongly suspect that I haven't guessed right.

PLEASE repost....type your ENTIRE problem EXACTLY as it is stated in your text. And show us what you have tried to do to solve the problem. With this information, we should be able to see how to help you.

 

[spicytakoyum]

Re: Finding the discriminant

That helped a lot- I realized I was typing the problem in wrong in the calculator.
Thank you,
Mabel