# Thread: Determining Values for A, B, and C in Quadratic Formula

1. ## Determining Values for A, B, and C in Quadratic Formula

I have a question:

For the quadratic equation (2x+1)(x+3)=0, does 2=a, 1=b, and 3=c?

2. ## Determining Values for A,B, and C in Quadratic Formula

Originally Posted by TiaharaJBennett
I have a question:

For the quadratic equation (2x+1)(x+3)=0, does 2=a, 1=b, and 3=c?
FIRST, please start a new thread for each new probelem you have.

No. The standard form of a quadratic equation is y = ax^2 + bx + c so you will first need to multiply (2x+1)(x+3) out and get it into standard form. Then you can see what a, b and c are.

3. Originally Posted by srmichael
FIRST, please start a new thread for each new probelem you have.

you will first need to multiple (2x+1)(x+3) out and get it into standard form. Then you can see what a, b and c are.
You mean multiply?

4. Of course he means multiply! Have you not learned FOIL yet?!

5. Originally Posted by mmm4444bot
Of course he means multiply! Have you not learned FOIL yet?!

Yes, I know about FOIL. But I haven't used it since I was in 9th grade. I'll figure it out though.

6. What grade are you in now?

7. Originally Posted by mmm4444bot
What grade are you in now?
I'm a junior.

8. Okay, I did the FOIL method, and got:
2x2+7x+3

2=a,7=b, and 3=c

9. Yes.

Are you thinking that you need to use the Quadratic Formula to solve the equation (2x+1)(x+3) = 0 ?

If so, I would like you to know that there is a much simpler method that uses something called the Zero-Product Property.

10. Originally Posted by mmm4444bot
Yes.

Are you thinking that you need to use the Quadratic Formula to solve the equation (2x+1)(x+3) = 0 ?

If so, I would like you to know that there is a much simpler method that uses something called the Zero-Product Property.
I've never learned that. How does it work? But yeah, I was going to just use the quadratic formula.

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