How would you find the y-coordinate of the vertex of a parabola if you only have the equation

See below.

Step-by-step explanation:

If you have the vertex form of the equation, shown below, the vertex is at (h, k) so the  y coordinate of the vertex is k:

y = a(x - h)^2 + k.

If the equation of the parabola is in standard form you can find it by converting to vertex form;

Find the vertex of the parabola y = x^2 - 2x - 10:-

y = x^2 - 2x - 10     Completing the square:

y = (x - 1)^2 - 1 - 10

y = (x - 1)^2 - 11

The vertex is at (1, -11).

y -coordinate is -11.

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8