Did you identify all errors in the problem did you

Question

Question:

 F(x)=-3x²+6x+3

X= - b = - 6        

        2a    2(-3)

F(1)=-3(1)²+6(1)+3

F(1) = -3+6+3

F(1)

MAXIMUM AT (1,12)

PLEASE SHOW THE STEPS 

NOTE THE - B= -6 are fractions the gaps numbers underneath each are joint together like fraction

Evaluation Criteria:

Your each question will be evaluated against the following criteria:

• Did you identify all errors in the problem?
• Did you correctly solve/simplify the problems, showing all steps and any formulas or properties that support the correctly solved problem?
• Did you write a few sentences explaining how to avoid making this mistake in future practice?