Since f(x) ≠ f(- x) then f(x) is not an even function. (–x)^4 – (–x)^3 is equivalent to x^4 – x^3.
A function is defined as a relation between the set of inputs having exactly one output each.
We need to find f(x) = x^4 – x^3 is an even function
If 2 functions are even, then
f(x) = f(- x)
f(x) = [tex]- x^3[/tex]
f(- x) = [tex]- (- x)^3 = + x^3[/tex]
Since f(x) ≠ f(- x) then f(x) is not an even function.
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