Question

How do you find domain and range for `y=3x^2`?

Answer 1

Domain = `RR`
Range = `[0,oo)`

Explanation:

Since this is a 2nd degree quadratic function, it implies its graph is a parabola and in this case with axis of symmetry at x=0 and y-intercept of 0, with the arms going up.

Therefore the domain is all real values for x, ie `RR=(-oo,oo)`

The range is all y values greater than or equal to zero, ie `y in[0,oo)`