# Evaluating Functions

• Aug 21st 2010, 03:50 PM
wrongnmbr
Evaluating Functions
Can someone confirm whether or not I came up with right answers for these?

1. f(y) = 5y - 3 ; f(2.4)

2. g(m) = 2m^2 - 18 / m^2 ; g(0)

3. h(q) =
q^2 + 20, q </= - 6
4q^2 + 20, q > -6
; h(-6)

4. g(s) =
s, s </= -1
s^2 + s, -1 < s </= 1
s^3 + s^2, s > 1
; g(-4/5)

Last one is obviously wrong, but I'm trying to figure out just what I did wrong. Any help would be appreciated.
• Aug 21st 2010, 04:31 PM
Jhevon
Quote:

Originally Posted by wrongnmbr
Can someone confirm whether or not I came up with right answers for these?

1. f(y) = 5y - 3 ; f(2.4)

2. g(m) = 2m^2 - 18 / m^2 ; g(0)

3. h(q) =
q^2 + 20, q </= - 6
4q^2 + 20, q > -6
; h(-6)

4. g(s) =
s, s </= -1
s^2 + s, -1 < s </= 1
s^3 + s^2, s > 1
; g(-4/5)

Last one is obviously wrong, but I'm trying to figure out just what I did wrong. Any help would be appreciated.

why do you say the last one is wrong?
• Aug 21st 2010, 05:03 PM
wrongnmbr
I wasn't expecting to come up with a fraction. I'm also not sure if I squared it correctly.
• Aug 21st 2010, 06:22 PM
Jhevon
Quote:

Originally Posted by wrongnmbr
I wasn't expecting to come up with a fraction. I'm also not sure if I squared it correctly.

• Aug 22nd 2010, 10:06 AM
wrongnmbr
Hmm, is there a way to check?
• Aug 22nd 2010, 12:07 PM
skeeter
Quote:

Originally Posted by wrongnmbr
Hmm, is there a way to check?

have a graphing calculator?

or, you can use this ...