Question

help will give out medal and fan

Answer 1

@-A @TechnoSoul @joquez14 @wyattp17 @DemolisionWolf

Answer 2

it opens, down, which one has an a that is negative

Answer 3

if it opens down, the leading coefficient must be negative
that gets rid of C and D
now lets find the vertex

Answer 4

that leaves you with only a and b

Answer 5

correct

and to find the vertex, use the equation -b/(2a) = x

Answer 6

um its b ?

Answer 7

um yes

Answer 8

yes, it is b.

Answer 9

\[-\frac{8}{2\times (-1)}=4\]

Answer 10

thanks i get it now