Is the function ƒ(x) = (–7)x an exponential function? if so, identify the base. if not, why not? a. no, the constant raised to a variable exponent is negative. b. yes, base = –7 c. yes, base = 7 d. no, there is no constant raised to a variable x.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

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