Find any relative max or min points of the given function

y=3x^2+12x+17

So far, I have:

y'=6x+12=0
2(3x+6)=0
x=-2

Ok, so you correctly found the x value for which that max/min occurs,

you are almost done.

You want the point, which consists of an x and a y value.
Don't you have the original equation telling you what y is ??

Btw, you must have recognized the equation as a parabola opening upwards.
So is your point a maximum or a minimum point ?