two different problems
a) g(x) = 2x^4 + 1
b) f(x) = 4x - 5x^3
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b. f(x)= 4x-5x^3. Because both powers are odd, this is an odd function. As you can as x gets larger, the entire function gets smaller. So as x approaches infinity, f(x) approaches negative infinity. Because the function is odd, it has the opposite behavior as x approaches negative infinity.