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

Question

abbycross167 · Answer

State the domain of y = x^2

koikkara · Answer

hey, you know: the domain is ALL REAL NUMBERS are from -INFINITY to + INFINITY.

koikkara · Answer

so, if u plot a graph....u my get parabola like open graph...from that you can find, .any number raised to the second power will always yield a positive integer or 0. Thus, y=x^2 won't have any negative y-values as the graph opens upward.

koikkara · Answer

may*

abbycross167 · Answer

Really? so for every question that asks for the domain I would say  "the domain is ALL REAL NUMBERS are from -INFINITY to + INFINITY". ?

koikkara · Answer

Negative values can be used for x, but the range is restricted because x2 ≥ 0. The correct answer is: The domain is all real numbers and the range is all real numbers f(x) such that f(x) ≥ 7.

abbycross167 · Answer

I'm a little confused...