Question

What is the domain and range for `y = 40 - 8x^2`?

Answer 1

`D={x∈R}`

`R={y∈R | x<=40}`

Explanation:

`color(violet)"Domain":` x can be any real number.

and

`color(violet)"Range":` y can be any real number however, it can only be less than or equal to 40.

graph{40-8x^2 [-10, 10, -5, 5]}