Question

Which function has a domain of all real numbers?

A. y=-x½+5 B. y=(2x)⅓-7 C. y=(x+2)¼ D. y=-2(3x)⅙?​

Answer 1

B.

Explanation:

B. Because the others have exponents whose denominators are even so the results of , for example x^1/2, if x is negative is not defined.

For example:

For A, when x is -4, (-4)^1/2 is not real.

For B, when x = -4, (2*-4)^ 1/3 = -8^(1/3) = = -2.

Answer 2

Explanation:

For all Plato users