Rozwiąż nierówność:
a) 3(x-2)(5-x)>0
b) x^-25>0
3(5x-x²-10+2x)>0
15x-3x²-30+6x>0
-3x²+21x-30>0
a=-3, b=21, c=-30
Δ=441-360=81
√Δ=9
x₁=-21-9/-6=-30/-6=5
x₂=-21+9/-6=-12/-6=2
b)x²-25>0
(x+5)(x-5)>0
x=-5 lub x=5
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a) 3(x-2)(5-x)>0
3(5x-x²-10+2x)>0
15x-3x²-30+6x>0
-3x²+21x-30>0
a=-3, b=21, c=-30
Δ=441-360=81
√Δ=9
x₁=-21-9/-6=-30/-6=5
x₂=-21+9/-6=-12/-6=2
b)x²-25>0
(x+5)(x-5)>0
x=-5 lub x=5