a) x² + x - 1 dla x = -1
(-1)² + (-1) - 1 = 1 + (-1) - 1 = -1
b) 2 (-x+4) dla x = -10
2 (- (-10) + 4) = 20 + 8 = 28
c) 1 - y + x dla x = -2, y = -1
1 - (-1) + (-2) = 2 + (-2) = 0
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a) x² + x - 1 dla x = -1
(-1)² + (-1) - 1 = 1 + (-1) - 1 = -1
b) 2 (-x+4) dla x = -10
2 (- (-10) + 4) = 20 + 8 = 28
c) 1 - y + x dla x = -2, y = -1
1 - (-1) + (-2) = 2 + (-2) = 0