Please help me this dont make no sense to me

Step-by-step explanation:

we know that

The equation of a vertical parabola into vertex form is equal to

where (h,k) is the vertex of the parabola

If the vertex is on the y-axis

then

the x-coordinate of the vertex is equal to zero

so

substitute

therefore

the vertex is the point

This function has the vertex on the y-axis

see the attached figure to better understand the problem