(1 point) Use a calculation device to find a quadratic function that fits the values below. x f(x) 0 -19 2 -1 4 5 6 -1 8 -19 If you express this function in standard form f(x)=ax2+bx+c then a= , b= , and c= . If you express this function in vertex form f(x)=a(x−h)2+k then a= , h= , and k= .