Question

Use these parent functions.

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Over what interval does the exponential parent function increase?
A. (1, ∞)
B. (0, ∞)
C. ​(−∞, 0)
D. (−∞, ∞)

Answer 1

D. The exponential parent function (e.g. f(x)=e^x or a^x with a>1) is increasing for all real x, since f'(x)=a^x ln a>0 for every x when a>1.