# 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?!

PS: I split your previous thread. Note the useful subject line.

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

PS: I split your previous thread. Note the useful subject line.
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

Right? Please say yes.

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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