Odpowiedzi

2009-12-28T08:23:46+01:00
X²+9x+k=0

x=-3 wstawiamy do r-nia

(-3)²+9*(-3)+k=0

9-27+k=0
k=18
4 5 4
2009-12-28T10:15:14+01:00
X²+9x+k=0
(-3)²+9*(-3)+k=0
9-27+k=0
k-18=0
k=18
odp. C
4 5 4
2009-12-28T10:19:33+01:00
X² + 9x + k = 0
___________________
(-3)² + 9 × (-3) + k = 0
___________________
9 - 27 + k = 0
___________________
k = 18
____________
ODP: C18.
4 5 4