Use the first few given points
for (0,-4) : -4 = 0 + 0 - 4 , nothing new learned here
for (1,0) : 0 = a + b - 4 ----> a+b+4 or b = 4-a
for (2,2) : 2 = 4a + 2b - 4 --- 2a + b = 3
2a + (4-a) = 3
a = -1
then b = 4-(=1) = 5
y = -x^2 + 5x - 4
test if the other points satisfy, they do!
You must write equation for any pair of points.
x=0 y= -4
-2b= -1 Divide with -2
a= -1 b=5 c= -4
Checking of results:
I make one mistake in typig.
-2b= -1 Divide with -2 is mistake
-2b= -10 Divide with -2 is correct
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