Hi guys, i need help with these questions, i have attempted the questions myself and just wanted to double check my answers.

convert to standard form

1.y= –3Y=-3(x+1/3)^2 -2/3) is this correct?x^{2}+ 2x+ 1 ( the answer i got is

2.) ( i can't figure how to solve this one)y= 4(x+ 5)(x– 2

3. Y= -1/2 x^2 ( the answer i got is Y= 2(1-3)+2

can someone please chck my answers and correct me i was wrong.