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

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

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Answer 1 · 2015-04-04T04:06:00

The domain is all real numbers. $D : {x : (x = R)} :$ $D:{x:(x=R)}:$
Domain is the set of all possible x values for a function. The function $y = 5 x^{2} + 2 x - 1$ $y=5x^2+2x-1$ 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 $- 1.2$ $-1.2$

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

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