## anonymous 5 years ago I have eoct tomorrow. i don't get the quadratic formula. the question is, "solve the equation using the quadratic formula" x2 + 3x - 7 = 0 What's a,b, and c?

1. anonymous

The quadratic formula is: $ax^2 + bx + c = 0 \implies x = \frac{-(b) \pm \sqrt{(b)^2 - 4(a)(c)}}{2(a)}$

2. anonymous

So looking at your equation: $x^2 + 3x - 7 = 0$ What number corresponds to a, b, and c?

3. anonymous

x^2=a 3x=b 7=c?

4. anonymous

Ok, so If I plug in those values for a, b, and c in the left part of my formula I should get the equation you have.

5. anonymous

$(x^2)x^2 + (3x)x + (7) = 0$ Is that your equation?

6. anonymous

Still thinking?

7. anonymous

no theres only 1 x^2 x2 + 3x - 7 = 0 thats my equation

8. anonymous

right. So what do we need to put in the blanks: $( )x^2 + ()x + () = 0$ To get something that is equal to your equation?

9. anonymous

Err equivalent rather.