rozwiąż nierówności
a)
(2x - 5)² ≤ 4x²
4x² - 20x + 25 ≤ 4x²
-20x ≤ - 25 / : (-20)
x ≥ 25/20
x ≥ 5/4
x ≥1,25
b)
(4x + 1)² > 4x(4x - 2)
16x² + 8x + 1 > 16x² - 8x
8x + 8x > -1
16x > -1
x > -1/16
c)
(x - 6)(x + 6) < (x - 6)²
x² - 36 < x² - 12x + 36
12x < 36 + 36
12x < 72
x < 6
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a)
(2x - 5)² ≤ 4x²
4x² - 20x + 25 ≤ 4x²
-20x ≤ - 25 / : (-20)
x ≥ 25/20
x ≥ 5/4
x ≥1,25
b)
(4x + 1)² > 4x(4x - 2)
16x² + 8x + 1 > 16x² - 8x
8x + 8x > -1
16x > -1
x > -1/16
c)
(x - 6)(x + 6) < (x - 6)²
x² - 36 < x² - 12x + 36
12x < 36 + 36
12x < 72
x < 6