Question

Help me?
y = 3x^2 + 2.
a. What is the domain?
b. What is the range?

Answer 1

the domain is all real numbers

Answer 2

domain and range corresponds to x and y

Answer 3

what x values are you allowed to put in there?

Answer 4

what y values will those x values produce?

Answer 5

so yea in this case we can plug in any real number we want... that means the domain is all real umbers

Answer 6

but what about the range?

Answer 7

The graph is an easy way to tell the range

Answer 8

the y values of the graph will go up and up forever

Answer 9

but it will never be lower than what value?

Answer 10

From the graph you can tell that the range will be everything above two because the range refers to the y values... so [2, infinity)

Answer 11

So, the range is 2 and the domain is infinity ?

Answer 12

nope close you still have domain and range a little bit confused

Answer 13

the range is "all numbers"

Answer 14

we are allowed to plug in any number we want and the equation will be valid

Answer 15

the domain is the answer to this question:
"what values for y is it possible for that function to be?"

Answer 16

well that function could be any number greater than 2

Answer 17

*greater than or equal to

so the range is all number greater than or equal to 2