## anonymous one year ago The equation f(x) = 3x2 − 24x + 8 represents a parabola. What is the vertex of the parabola? (−4, 152) (4, −40) (−3, 107) (3, −37)

1. anonymous

will fan and medal!?!??!

2. misty1212

HI!!

3. anonymous

hi

4. misty1212

first coordinate of the vertex of $$y=ax^2+bx+c$$ is always $$-\frac{b}{2a}$$ in your case $$a=3$$ and $$b=-24$$ what do you get ?

5. anonymous

i really dont get like any of it

6. misty1212

what i meant was "what do you get for $-\frac{b}{2a}$when you replace $$a$$ by $$3$$ and $$b$$ by $$-24$$ and do the arithmetic

7. anonymous

3/48

8. anonymous

negative

9. misty1212

not very close actually the b goes up top, the a goes in the bottom

10. anonymous

ok

11. anonymous

24/6

12. misty1212

$\huge -\frac{\color{blue}b}{2\times \color{red}a}$yeah that looks good

13. anonymous

24/6

14. misty1212

of course 6 goes in to 24 evenly so your answer is not a fraction, it is a whole number

15. anonymous

4?

16. misty1212

no not 4? just 4

17. anonymous

-4?

18. misty1212

no $24\div6=4$ you had it right the first time q

19. anonymous

ok so the awnser would be B

20. anonymous

???

21. misty1212

idk does B have a 4 as the first coordinate?

22. anonymous

yes

23. anonymous

@misty1212 can you help me with one more