How do you find the domain and range of #f(x)=3x^2-5#?
1 Answer
Domain =
Range =
Explanation:
Domain is the possible x-values that can be put into the equation.
Range is all the possible y-values that can come out of the equation.
All quadratic equations have a domain of all real numbers, because any x-value can be plugged into the equation, and because the parabola extends width wise for infinity.
A domain of all real numbers can be written as
The range of quadratic equations depends on the vertex. To find the vertex of the equation, first put it in standard form (
the x-value of the vertex is 0. substitute it back in to get the y-value.
So the vertex is (0, -5). The range is either
Since
So the range is
Domain and range are easier to find when you have the graph of the equation:graph{3x^2 - 5 [-10.59, 9.41, -6.16, 3.84]}