Question

What is the domain of the function y = x2 + 4x - 2 ?

a. All real numbers
b. x < 6
c. All negative numbers
d. y > 6

Answer 1

The answer should be A, all real numbers.

This is a quadratic and all quadratic equations have a domain of all real numbers. We know this is a quadratic because it is written in y=ax^2+bx+c form where a is not 0.