Question

What is the range of the graph of y = −3x2 − 6x + 4?

Answer 1

Select one:
a. y ≤ −1
b. y ≥ 7
c. y ≤ 7
d. All real numbers

Answer 2

Have you plotted the graph?

Answer 3

Isnt there an equation where i dont have to graph this

Answer 4

Yes, find the vertex!

Answer 5

How would i do this

Answer 6

well the vertex lies on x= -b/2a and the y value that this represents

Answer 7

6/6?

Answer 8

No, try again

Answer 9

x= -1?

Answer 10

yeah that's it. now work out the y-value

Answer 11

y=19?

Answer 12

No try again carefully

Answer 13

do i square just the -1? or the 3

Answer 14

3x^2 = 3(-1)^2

Answer 15

alright so i got positive 7

Answer 16

That's better! so the vertex is at the point (-1,7)

now this is a parabola so which way does it go from the vertex, upwards or downwards?

Answer 17

downwards

Answer 18

correct! so what is the range?

Answer 19

so c

Answer 20

well done!!

Answer 21

What is the domain of the graph of y = −2x2 − 8x + 1?

Answer 22

all i need for this is 2b?2a right

Answer 23

-b/2a**

Answer 24

x = 2

Answer 25

@alekos

Answer 26

are you there? i'm back online