Question 821153
A little bit of help:


(1)
The y coordinate depends on what you choose for x.  Did you want to ask about something other than, "y coordinate"?  If you want the y-intercept, then this would be f(x) when x=0, which is {{{f(0)=3(0-1)(0+4)=3(-1)(4)=highlight(-12)}}}.


(2)
Complete The Square and adjust the form into {{{y=a(x-h)^2+k}}}.
Start THIS way:
{{{y=-5(x^2-4x-2/5)}}};
ADD and SUBTRACT the term, {{{(-4/2)^2=4}}}  INSIDE the parenthesized quadratic expression...
Can you do the rest?