Question

Hello. I need to know how to solve: find the vertex of the equation: y=-3x^2-4x+9.plueze help!

Answer 1

\[Vertex = (-\frac23, \frac{31}{2})\]

Answer 2

thanks. would you show the work? I need to know step by step. thanks.

Answer 3

there is a formula for the vertex.

Answer 4

Shortcut:
-b/2a.
\[-\frac{-4}{2(-3)}\to - \frac{-4}{-6} \to -\frac12\]

Answer 5

Now insert this value in the equation and find out the y-cordinate.

Answer 6

we just over this in class last night. so pardon me for saying...where in the equation do i insert it?

Answer 7

in the original

Answer 8

so I subsitute the x?

Answer 9

yes

Answer 10

okay thanks

Answer 11

Have more problems?

Answer 12

lots.

Answer 13

Post em!

Answer 14

actually 4

Answer 15

Wow, we will take ages to do those.

Answer 16

lol

Answer 17

;)

Answer 18

quadratic equations with solutions of \[{ 3/4 \-1/4}\] is defined as: write the equation

Answer 19

\[\frac34 , -\frac14\]That?

Answer 20

yes

Answer 21

(x-3/4)(x+1/4)

Answer 22

multiply it out

Answer 23

okay