Christopher J. answered • 09/21/20

Berkeley Grad Math Tutor (algebra to calculus)

Fizaa:

The first question is "is it true that for all real numbers x, there exists a real y such that y^{3}=x. Try plugging in a negative x value, say -8. Is there a y such that y^{3} = -8? Yes, take y = -2. Try plugging in a positive y value, say x =1. Is there a y such that y^{3} = 1. Yes y = 1. Try drawing the graph of y^{3}=x and see if there are any values of x for which y is undefined.

Use the same idea for the second question.