Liczby 7 i -3 są pierwiastkami równania: A. (x - 3)(x + 7) = 0 B. (x + 3)(x - 7) = 0 C. (x - 3)(x - 7) = 0 D. (x + 3)(x + 7) = 0 pomóżcie!!
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B. (x + 3)(x - 7) = 0
x+3=0 U x-7=0
x=-3 x=7
odp: B
A. (x - 3)(x + 7) = 0
x-3=0 lub x+7=0
x=3 x=-7
--------------------
B. (x + 3)(x - 7) = 0
x+3=0 lub x-7=0
x=-3 x=7
--------------------
C. (x - 3)(x - 7) = 0
x-3=0 lub x-7=0
x=3 x=7
--------------------
D. (x + 3)(x + 7) = 0
x+3=0 lub x+7=0
x=-3 x=-7
--------------------
Odp. B