How do I find the domain of #f(x)=5x^2+2x-1#?

1 Answer
Kevin B.
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+2x-1# is a parabola graphed below:

graph{5x^2+2x-1 [-10, 10, -5, 5]}

The function stretches infinitely in both x-directions and is uninterrupted. The y-values (range) are restricted to all values greater than #-1.2#

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