Please help me on this question

Aquadratic function is a polynomial function with a degree of 2, which is a parabola.parabolas that open upwards (without a reflection in the horizontal axis) will be increasing to the right of its vertex and decreasing to the left of its vertex. (decreasing is viewed from a left to right perspective. imagine a parabola that opens upward: the y-coordinates are decreasing as it approaches the vertex from the left. then as it moves out from the parabola rightwards, the y-coords increase.)so the vertex has to have its x-coordinate at x=3.the y-coordinate does not matter; let us choose y=0.so a possible vertex is at (3,0). using the standard form of a parabola we have h=3, k=0; therefore: the  parameter is unknown.we want to have a y-intercept at 14. this implies that if we plug in x=0 into the function, we should get y=14. so do this substitution and solve for  so a possible equation is