Question

How do you find the axis of symmetry, and the maximum or minimum value of the function `y = x^2 + 2x – 3`?

Answer 1

Axis of symmetry `x_0=-1`
Minimum `y_0=-4`

Explanation:

Axis of symmetry of parabola is: `x_0=-2/(2*1)=-1`
Minimum: `y(x_0)=(-1)^2+2*(-1)-3=-4`
Maximum is no.