Question

What is the domain of the graph of y = −2x2 − 4x + 7?

x ≤ 1

x ≤ −1

All real numbers

x ≥ −1

Answer 1

Hint: Is there any number you can think of where inputting an x value would not give you a y value?

Answer 2

no so then i think it would be all real numbers

Answer 3

:) You did it! And @Hero explained a good process for determining a function's domain. Always ask yourself: "are there any values of x you can input that will give you a non-real ouput/ an output that doesn't exist?"

Answer 4

And if so then these values of x are not in your domain.

Answer 5

I don't think getting rid of the delete button would be a good idea