Question

A parabola passes through (-1,0),(0,1),(1,3)
Coordinates of the vertex?

Answer 1

Three will be two parabola with directrix parallel to either axis.

Answer 2

Ref: http://mathworld.wolfram.com/Parabola.html

Answer 3

try with y= ax^2 +bx +c

Answer 4

So that means you are assuming that the axis of symmetry is parallel to y axis. I don't think this is the right assumption in the general case.

Answer 5

Obviously if that's the case this boils down to simple substitution and then solving 3 simultaneous equation.

Answer 6

It wasn't intended to be difficult....:-)

Answer 7

No takers...
Closing.