Question

f(x)=1-x^2 is this a function

Answer 1

@christinashalee, have you tried graphing 1 - x^2 yet?

Answer 2

no not yet

Answer 3

Graph it and use the vertical line test for a function

Answer 4

ok thanks

Answer 5

You can graph the function mentally if you remember what the graph of x^2 looks like. y = x^2 is a parabola with vertex at the origin and opens upward. y = -x^2 will be a parabola with vertex at the origin that opens downward. y = 1-x^2 is the previous parabola that is shifted up by 1 unit: vertex at (0,1) and downward opening parabola. If you draw a vertical line at any x value will it intersect the parabola just once or more than once?

Answer 6

If you're having trouble graphing it, you can use this program to help you:

http://www.desmos.com