Question

The vertex of this parabola is at (-2, 5). Which of the following could be its equation?

Answer 1

choices?

Answer 2

c

Answer 3

please do not give direct answers

Answer 4

can u teach me how to do it

Answer 5

i would suggest graphing it

https://desmos.com

Answer 6

the site is blocked

Answer 7

https://www.desmos.com/calculator

Answer 8

plug in x, if the value of y matches that is your answer

Answer 9

how do i plug in x?

Answer 10

y = c(x-x1) + y1
where (x1, y1) is vertex that is (-2,5) in this case...
c can be any number which is 3 in this case

Answer 11

"The vertex of this parabola is at (-2, 5). Which of the following could be its equation? " Think: the "vertex form of the equation of a parabola" is y=a(x-h)^2+k, where (h,k) represents the vertex. Take the given vertex and subst. its coordinates into this "vertex form." Try it. Your result should eliminate all but 1 or 2 of the possible answer choices.

Answer 12

where did the 3 come from?

Answer 13

it doest have to be 3 , it can be any number

Answer 14

so that number is random?

Answer 15

You don't have enuf info to determine that. You're not asked to find the y-intercept, but rather the answer form closest enough to the vertex form of the eq'n of a parabola.

Answer 16

depends how wide or thinner you want your parabola to be...in the question above, you dont need to care about such thing but only vertex so, it can be anything

Answer 17

ohhh ok

Answer 18

so the second part would be (x-2)²+5

Answer 19

Check your (x-2). Not correct.

Answer 20

why would it not be x-2?

Answer 21

Vertex is at (-2,5), mpt at (2,5).

Answer 22

what is mpt

Answer 23

Review the eqution I gave you: y=a(x-h)^2+k, and the given vertex: (-2,5)

Answer 24

mpt=not. Sorry.

Answer 25

why would it be x+2

Answer 26

because you are forming (x-h) from h=-2.

Try it.

Answer 27

(x-2): incorrect
(x-[-2]) = (x+2): correct

Answer 28

oh -+- = +

Answer 29

Yes.

Answer 30

AnswerC