Can someone please help me fix this math question? please? I'll fan and give a medal!!

Question

abbycross167 · Answer

Question--
State the domain of y = 2x2 + 3
My answer-
 Domain = all negative numbers, and all positive numbers.

abbycross167 · Answer

what my teacher said-
"so x cannot be 0?"

dumbcow · Answer

Domain is all real numbers.

Your teacher was pointing out that "0" is neither positive or negative

mathstudent55 · Answer

The domain is all real numbers.
That includes all negatives, all positive, and zero.

mathstudent55 · Answer

When you say all negatives and all positives, you are not including zero, but since the domain is all real numbers, you need to include zero. instead of saying all negatives all positives and zero, just say all real numbers.

abbycross167 · Answer

oh thank you very much!!!

mathstudent55 · Answer

yw