## Katlyn99 Group Title Solve the following using the quadratic formula. Round to the nearest tenth, if necessary. x2 + 5x - 2 = 0 {-2, 5} {-5.4, 0.4} {-1, 0.5} No real solution one year ago one year ago

1. Mertsj

Do you know the quadratic formula?

2. Mertsj

Look in you book. It's in there.

3. Mertsj

Did you find it?

4. Katlyn99

yes

5. Mertsj

So in your equation, a = 1, b = 5, and c = -2 Just plug in those numbers in place of the letters.

6. Mertsj

$x=\frac{-5\pm \sqrt{5^2-4(1)(-2)}}{2(1)}$

7. Mertsj

Does yours look like that so far?

8. Katlyn99

yes

9. Mertsj

$x=\frac{-5\pm \sqrt{33}}{2}$

10. Mertsj

Oh gees. They gave the answers in decimal form so now we need a calculator. Do you have one handy?

11. Katlyn99

yes

12. Mertsj

$\frac{-5+\sqrt{33}}{2}=.37\approx .4$ $\frac{-5-\sqrt{33}}{2}=-5.37\approx -5.4$

13. Mertsj

Is that what you got?

14. Katlyn99

yes

15. Mertsj

Good job!!

16. Katlyn99

Thanks:)

17. Mertsj

you're welcome