Question

Find the domain of the function f(x)=5x^2+9x-2

Answer 1

Since the function is a quadratic function, then the domain is the set of all real values of x that will give real values for y.

Hence x can range from;

`-\propto\text{ to +}\propto`

and whatever real value of x that is put into the function gives real values of y.

Therefore the domain for the function is a set of real values of x ranging from minus infinity to plus infinity.