y = -2x²+4x = -2(x²-2x) = -2(x²-2x+1-1) = -2(x-1)² + 2
-2(x-1)² <= 0 |+2
-2(x-1)² + 2 <= 2
E(y): (-∞; 2]
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y = -2x²+4x = -2(x²-2x) = -2(x²-2x+1-1) = -2(x-1)² + 2
-2(x-1)² <= 0 |+2
-2(x-1)² + 2 <= 2
E(y): (-∞; 2]