Question

What is the axis of symmetry of the graph of y = 2(x – 3)2 – 7?


A)x = –6

B) x = 2

C)x = 3

D)x = 7

Answer 1

Find the derivative. set it to zero and solve for x.

Answer 2

im confused

Answer 3

multiply out
y = 2x^2 -12x + 11

Answer 4

vertex is at -b/2a

Answer 5

so the answer would be A

Answer 6

the sign is wrong

Answer 7

-b/2a = -(-12/4) = 3

Answer 8

you lost me im confused again

Answer 9

we obtained an equation
y = 2x^2 -12x + 11

there is a formula to find the vertex
x = -b/2a
do you know it?

Answer 10

For a quadratic equation in the vertex form,
y = a(x-h)^2 + k
axis of symmetry is x = h
while the vertex is at (h,k)
Now, you have f y = 2(x – 3)^2 – 7, identify what h is in this case and you can get your answer.

Answer 11

so you have the same answer!

Answer 12

when i do that i get 3 so that would be the answer correct?