What is the domain of a function like #f(x) = 5x^2#?

1 Answer
Apr 4, 2015

The domain is all real numbers. #D:{x:(x=R)}#
Domain is the set of all possible #x# values for a function. The function #y=5x^2# is a parabola graphed below:
graph{5x^2 [-10, 10, -5, 5]}

The function stretches infinitely in both x-directions and is uninterrupted. The y-values (range) are restricted to all numbers greater than zero.