║ -2, если х < -1,
f (х) = ║ х² + 2х - 1, если -1 ≤ х < 2,
║ 4х - 1, если х ≥ 2,
f (-1,34) = -2,
f (-1) = (-1)² + 2*(-1) - 1 = 1 - 2 - 1 = -2,
f (0) = 0² + 2*0 - 1 = 0 + 0 - 1 = -1,
f (1,5) = (1,5)² + 2*1,5 - 1 = 2,25 + 3 - 1 = 4,25,
f (5) = 4*5 - 1 = 20 - 1 = 19
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Answers & Comments
║ -2, если х < -1,
f (х) = ║ х² + 2х - 1, если -1 ≤ х < 2,
║ 4х - 1, если х ≥ 2,
f (-1,34) = -2,
f (-1) = (-1)² + 2*(-1) - 1 = 1 - 2 - 1 = -2,
f (0) = 0² + 2*0 - 1 = 0 + 0 - 1 = -1,
f (1,5) = (1,5)² + 2*1,5 - 1 = 2,25 + 3 - 1 = 4,25,
f (5) = 4*5 - 1 = 20 - 1 = 19