Question 55971
Vertex form is {{{highlight(y=a(x-h)^2+k)}}}, the vertex is (h,k)
Notice that x doesn't have a coefficient inside the parenthesis, if x^2 has a coefficient you factor, then complete the square.  This one is different because a isn't 1 and there's no b.
{{{y=5x^2-6}}}
{{{y=5(x-0)^2-6}}} is vertex form, the vertex is (0,-6), because a>1 the parabola is skinnier.
Take a look:
{{{graph(300,200,-10,10,-10,10,5x^2-6)}}}
Happy Calculating!!!