A. x² + 5x + 6 = 0
dla x = 2
L = 2² + 5 · 2 + 6 = 4 + 10 + 6 = 2
P = 0
L ≠ P
B. x² + 5x - 6 = 0
L = 2² + 5 · 2 - 6 = 4 + 10 - 6 = 8
C. x² - 5x + 6 = 0
L = 2² - 5 · 2 + 6 = 4 - 10 + 6 = 0
L = P
dla x = 3
L = 3² - 5 · 3 + 6 = 9 - 15 + 6 = 0
D. x² - 5x - 6 = 0
L = 2² - 5 · 2 - 6 = 4 - 10 - 6 = -12
Odp. C.
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A. x² + 5x + 6 = 0
dla x = 2
L = 2² + 5 · 2 + 6 = 4 + 10 + 6 = 2
P = 0
L ≠ P
B. x² + 5x - 6 = 0
dla x = 2
L = 2² + 5 · 2 - 6 = 4 + 10 - 6 = 8
P = 0
L ≠ P
C. x² - 5x + 6 = 0
dla x = 2
L = 2² - 5 · 2 + 6 = 4 - 10 + 6 = 0
P = 0
L = P
dla x = 3
L = 3² - 5 · 3 + 6 = 9 - 15 + 6 = 0
P = 0
L = P
D. x² - 5x - 6 = 0
dla x = 2
L = 2² - 5 · 2 - 6 = 4 - 10 - 6 = -12
P = 0
L ≠ P
Odp. C.