Rozwiąż nierówność:
a) x²<1
b)⅓x²+4>0
d)x²≥4
e)-4x²-1<0
x² - 1 < 0
(x - 1)(x +1) < 0
x∈ (-1, 1)
1/3(x² + 12) > 0 / : 1/3
x² + 12 > 0
x ∈ R
x² - 4 ≥ 0
(x - 2)(x +2) ≥ 0
x ∈ (-oo, -2 > u < 2, +oo)
-(4x² + 1) < 0 / *(-1)
4x² + 1 > 0
e---->należy
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a) x²<1
x² - 1 < 0
(x - 1)(x +1) < 0
x∈ (-1, 1)
b)⅓x²+4>0
1/3(x² + 12) > 0 / : 1/3
x² + 12 > 0
x ∈ R
d)x²≥4
x² - 4 ≥ 0
(x - 2)(x +2) ≥ 0
x ∈ (-oo, -2 > u < 2, +oo)
e)-4x²-1<0
-(4x² + 1) < 0 / *(-1)
4x² + 1 > 0
x ∈ R
e---->należy