y=-2x^+bx+c
A=(0;1)
1 = -2 * 0^2 + b * 0 + c
B=(-1;-4)
-4 = -2 *(-1)^2 + b * (-1) +c
1 = -2 * 0 + 0 + c
-4 = -2 * 1 - b + c
c = 1
-4 = -2 - b + 1
-4 = - 1 + b
-4 + 1 = b
b = -3
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y=-2x^+bx+c
A=(0;1)
1 = -2 * 0^2 + b * 0 + c
B=(-1;-4)
-4 = -2 *(-1)^2 + b * (-1) +c
1 = -2 * 0 + 0 + c
-4 = -2 * 1 - b + c
c = 1
-4 = -2 - b + 1
c = 1
-4 = - 1 + b
c = 1
-4 + 1 = b
c = 1
b = -3