1. Rozwiąż równanie -2|x|+3=-7
2. Rozwiąż nierówność 3|x|+2>5
zadanie 1
-2|x| + 3 = -7
-2|x| = -10
|x| = 5
x = 5 ∨ x = -5
zadanie 2
3|x| + 2 > 5
3|x| > 3
|x| > 1
x > 1 ∨ x < -1
x∈ (-∞; -1) U (1; +∞)
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Litterarum radices amarae sunt, fructus iucundiores
Pozdrawiam :)
1.
-2|x| = -10 /:(-2)
x = 5 lub x = -5
2.
3|x| > 5 - 2
3|x| > 3 /:3
x > 1 lub x < -1
x∈ (-oo -1) u (1; +oo)
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zadanie 1
-2|x| + 3 = -7
-2|x| = -10
|x| = 5
x = 5 ∨ x = -5
zadanie 2
3|x| + 2 > 5
3|x| > 3
|x| > 1
x > 1 ∨ x < -1
x∈ (-∞; -1) U (1; +∞)
----------------------------------------------------------------------------------------------------
Litterarum radices amarae sunt, fructus iucundiores
Pozdrawiam :)
1.
-2|x| + 3 = -7
-2|x| = -10 /:(-2)
|x| = 5
x = 5 lub x = -5
2.
3|x| + 2 > 5
3|x| > 5 - 2
3|x| > 3 /:3
|x| > 1
x > 1 lub x < -1
x∈ (-oo -1) u (1; +oo)