Question

What is the x-coordinate of the vertex of this parabola? y = -3x^2+12x-5

Answer 1

y = -3x² +12x - 5
y = -3(x² + 4x) - 5
y = -3(x² + 4x + 4 - 4) - 5
y = -3(x² + 4x + 4) + 12 - 5
y = -3(x + 2)² + 7

x-coordinate is (-2 , 7)

Answer 2

what is a parabola?

Answer 3

Answer Choices...
A.)-3
B.)2
C.)12

Answer 4

is it B)

Answer 5

Thats what im wondering..

Answer 6

me too....

Answer 7

well, let's see if @HairtUB knows the answer.

Answer 8

^Right

Answer 9

ok=]

Answer 10

Ok wait, yeah it's B. I made a mistake in my calculations. Here's the correct version:

y = -3x² +12x - 5
y = -3(x² - 4x) - 5
y = -3(x² - 4x + 4 - 4) - 5
y = -3(x² - 4x + 4) + 12 - 5
y = -3(x - 2)² + 7

coordinate is (-2 , 7)
x-coordinate is 2.

Answer 11

^Thanks

Answer 12

ok, i was right, thank u

Answer 13

you were :D

Answer 14

:D

Answer 15

No prob :)
And sorry for the confusion :/

Answer 16

its okay:)