Question

For the equation y = -3x2, find: a) Domain b) Range

Answer 1

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

D=(⁻∞,∞)
R=(⁻∞,0]