Hey, there are a few more questions i am strugling with.

2(i) Express 3x²+12x+7 in the form 3(x+a)² +b

I think its 3(x+2)²-5 is that right?

(ii) Hence write down the equation of the line of symmetry of the curve y=3x²+12x+7

Would appreciate the help!

Next one:

10(iv) Given that 24x+3y+2=0 is the equation of the tangent to the curve at the point (p,q), find p and q. (The curve is y=1/3x³-9x.)

Thanks for all the help you guys are giving me!