Rozwiąż równania i nierówności
b) |4x-1| = 3
c) |3+2x| 9
d) |3-x| 5
a)
x^2 + 5x - 6 = 0
x^2 - x + 6x - 6 = 0
x(x - 1) + 6(x - 1) = 0
(x - 1)(x + 6) = 0
x - 1 = 0 lub x + 6 = 0
x = 1 lub x = -6
b)
|4x - 1| = 3
4x - 1 = 3 lub 4x - 1 = -3
4x = 4 lub 4x = -2
x = 1 lub x = -1/2
c)
|3 + 2x| ≤ 9
-9 ≤ 3 + 2x ≤ 9
-9 - 3 ≤ 2x ≤ 9 - 3
-12 ≤ 2x ≤ 6 /:2
-6 ≤ x ≤ 3
odp. x ∈ <-6, 3>
d)
|3 - x| ≥ 5
3 - x ≥ 5 lub 3 - x ≤ - 5
-x ≥ 2 lub -x ≤ - 8
x ≤ - 2 lub x ≥ 8
odp. x ∈ (-oo, -2> u <8, +oo)
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a)
x^2 + 5x - 6 = 0
x^2 - x + 6x - 6 = 0
x(x - 1) + 6(x - 1) = 0
(x - 1)(x + 6) = 0
x - 1 = 0 lub x + 6 = 0
x = 1 lub x = -6
b)
|4x - 1| = 3
4x - 1 = 3 lub 4x - 1 = -3
4x = 4 lub 4x = -2
x = 1 lub x = -1/2
c)
|3 + 2x| ≤ 9
-9 ≤ 3 + 2x ≤ 9
-9 - 3 ≤ 2x ≤ 9 - 3
-12 ≤ 2x ≤ 6 /:2
-6 ≤ x ≤ 3
odp. x ∈ <-6, 3>
d)
|3 - x| ≥ 5
3 - x ≥ 5 lub 3 - x ≤ - 5
-x ≥ 2 lub -x ≤ - 8
x ≤ - 2 lub x ≥ 8
odp. x ∈ (-oo, -2> u <8, +oo)