## anonymous one year ago The graph of which function has an axis of symmetry at x =-1/4 ? f(x) = 2x2 + x – 1 f(x) = 2x2 – x + 1 f(x) = x2 + 2x – 1 f(x) = x2 – 2x + 1

1. Nnesha

$\huge\rm x=\frac{ -b }{ 2a }$ to find c-coordinate of vertex(axis of symmetry)

2. Nnesha

b and a values are $\rm Ax^2+Bx+C$ where a=leading coefficient b=middle term c=constant term

3. anonymous

will give medals

4. anonymous

5. anonymous

@Nnesha

6. Nnesha

i know so which is your answer A , B ,C or D >

7. anonymous

im thinkin c

8. anonymous

@Nnesha

9. Nnesha

no.

10. anonymous

im horrible at math lol but my next guess is d

11. Nnesha

don't guess next time when you say is it B or A or D i'll ask to explain it for me

12. Nnesha

start with 1st option okay what is a and b value in that equation

13. anonymous

2

14. Nnesha

a=2 right b=1 x is same as 1x not substitute a and b for their value into that formula

15. anonymous

-1/2*2?

16. Nnesha

yes right multiply 2 times 2 ?

17. anonymous

-1/4

18. anonymous

19. Nnesha

i think so :=)

20. anonymous

thank you!!!

21. Nnesha

you're lucky don't have to check other 3 options ...

22. Nnesha

np