Question

what is the inverse of y=x^2+3

Answer 1

is square root of -x+3 the same as the square root of x-3?

Answer 2

You have\[y=x^2+3.\]
1. Switch the variables.\[x=y^2+3\]2. Solve for \(y\).\[y=\pm\sqrt{x-3}.\]

Answer 3

why is it positive & negative?

Answer 4

When you take the square root of something, you have to take into consideration both the positive and negative.

Answer 5

@across what about the inverse of y= -x^2+5

Answer 6

The concept is the same process; switch it. So x = -y^2 + 5. so x-5 = -y^2. But simply divide by a negative sign so you get -x+5 = y^2. So y = sqrt(-x+5).

Answer 7

*+/- squrt. Sorry about that.

Answer 8

wait so its positive and negative too?

Answer 9

@ilikedtea680 what about this one