Answer: D. g(x)
Step-by-step explanation: since,f(x)=-x^4-2
x^4>=0 for all x so,-x^4<=0 for all x
⇒ -x^4-2<=-2 for all x
⇒ f(x)<=-2 for all x so, maximum possible value of f(x)=-2
whereas g(x)= -3x^3+2 can take values from (-∞,∞)
so, g(x) has the maximum y value
