Help with functions

Complex numbers, rational functions, logarithms, sequences and series, matrix operations, etc.
Hell0
Posts: 24
Joined: Sun Jun 23, 2013 5:04 am
Contact:

Help with functions

Postby Hell0 » Tue Sep 03, 2013 1:32 am

y= ±2x+7
y= rad(5-x) (all under the rad)
y= 1/(x+62) - 2
y= -3^x + 41 (no parentheses around the -3 purposely)

how many are functions? this is what i think

no, yes, yes, yes
what do you think and why?

FWT
Posts: 117
Joined: Sat Feb 28, 2009 8:53 pm

Re: Help with functions

Postby FWT » Tue Sep 03, 2013 10:15 am

Hell0 wrote:y= ±2x+7
y= rad(5-x) (all under the rad)
y= 1/(x+62) - 2
y= -3^x + 41 (no parentheses around the -3 purposely)

how many are functions? this is what i think

no, yes, yes, yes
what do you think and why?

I agree. Why? Because the last three match the definition of "function" but the first one doesn't.


Return to “Advanced Algebra ("pre-calculus")”