Algebra2

Helpp?
Graphs of functions !!
I need to determine if these are odd or even?

1. f(x)=x^5-x

2. f(x)=5

3.f(x)=x^4+2x^3

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1. even if f(-x) = f(x)
odd if f(-x) = -f(x)

even if all powers are even
odd if all powers are odd

remember that 0 is an even power

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2. So These Are all even?!
Sorry I'm still kind of lost..

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3. come on. can't tell even and odd numbers?!?!?

x^5-x = x^5 - x^1
5 and 1 are both odd, so f(x) is odd

5 = 5x^0
0 is an even power, so f(x) is even

x^4 + 2x^3
4 is even, 3 is odd, so f(x) is neither even nor odd.

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