Which equation represents an exponential function that passes through the point (2, 80)?
Answer
A
f(x) = 4(x)5
B
f(x) = 5(x)4
C
f(x) = 4(5)x
D
f(x) = 5(4)x
Explanation
An exponential function has the variable in the exponent. For choice D, f(x) = 5(4)^x, so f(2) = 5 · 4² = 5 · 16 = 80. Therefore, it passes through (2, 80).
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