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x=-3 wstawiamy do r-nia
(-3)²+9*(-3)+k=0
9-27+k=0
k=18
(-3)²+9*(-3)+k=0
9-27+k=0
k-18=0
k=18
odp. C
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(-3)² + 9 × (-3) + k = 0
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9 - 27 + k = 0
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k = 18
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ODP: C18.