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y = 4-a
4-a = -2 * (-1)^2
4-a = -2 * 1
4-a = -2
-a = -2 - 4
-a= -6 / *(-1)
a= 6
f(-1) = -2(-1)^2 = 4-a
2 = 4-a
-6 = -a => a = 6
podstawiasz za y=4-a za x=-1
4-a=-2
a=6