Question

Which function is an odd function?

(A) f(x)=0.8x^3
(B) f(x)=5x^2
(C) f(x)=0.7x^2 + 3
(D) f(x)=3x - 1

Answer 1

A function is odd if:
f ( - x ) = - f ( x )
A ) f ( - x )= 0.8 ( - x ) ^3 = - 0.8 x^3 = - f ( x )
Answer: A ) f ( x ) = 0.8 x^3 is an odd function.
Functions B ) and C ) are even and D) is neither even nor odd.