Interpreting the question as "evaluate f(x) = -x2 + 5 for x = 4". This is the same as asking "what is f(4)". To evaluate f(4) just replace each instance of the x in the definition of f(x) by the number 4: f(4) = -42 + 5. The result is -11.
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Yes.
in general, the y-intercept of the function f(X)= axb^x is the point__.
False
f(x) = bX is not an exponential function so the question makes no sense.
x = ¼x^4 + 4x + k where k can be any number