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y = A x^2 + B x + C
y = 3/2 x^2 -1 x + 8
A=3/2 B=-1 C=8
they are all like this... A is the coeficient of X^2 (the number before X^2)
if there is no number, but the term is still there, then it is 1
if the term is missing, then it is 0
a is the leading coefficient, the number in front of the highest power of x. In the first equation, a = 3/2. In the second, a = 4 because 7x-3x can be simplified to 4x.
b is the coefficient in front of the second highest power of x. In the first equation, b = -1, since the x is negative. In the second equation, it is also -1, despite the number being a constant.
c, as you might guess, is the coefficient of the next highest power of x after b. The first equation has a c of 8, the second equation has no c, or a c of 0.