Domain s the numbers you can use range is the result from putting the domain in
domain is all real numbers range, see that -3x^2, all things become positive then negative so highest thing would be at x=0, so then the highest thing in the range is 0 test another x=3 the result is -27 0>-27
range is y≤0
domain=all real number range is all real numbers less than or equal to 0 in interval notation
