Question

Which of the following equations is of a parabola with a vertex at (1, -1)?



y = (x - 1)^2 - 1

y = (x - 1)^2 + 1

y = (x + 1)^2 - 1

y = (x + 1)^2 + 1

Answer 1

How you tell is that the x coordinate comes after the x in the equation with a switched sign. So it's either A or B.
Then the y coordinate is on the end with a normal sign, so you're left with A.
Hope that helps! :)

Answer 2

a