1.
|x - 4| ≥ 5
x - 4 ≥ 5 ∨ x - 4 ≤ -5
x ≥ 9 ∨ x ≤ -1
x ∈ (-∞ ; -1> ∪ <9 ; +∞)
2.
|3/4 + 5/4x| < 1/4
3/4 + 5/4x < 1/4 / * 4 ∧ 3/4 + 5/4x > -1/4 / * 4
3 + 5x < 4 ∧ 3 + 5x > -4
5x < 1 / : 5 5x > -7 / : 5
x < 1/5 x > -7/5
x ∈ (-7/5 ; 1/5)
3.
x - 1 ≠ 0
x ≠ 1
-7 / (x - 1) = 8 / * (x - 1)
-7 = 8 * (x - 1)
-7 = 8x - 8
8x = 1 / : 8
x = 1/8
4.
x² - 9 ≠ 0
x² ≠ 9
x ≠ 3 ∨ x ≠ -3
(2x² - 10) / (x² - 9) = 1 / * (x² - 9)
2x² - 10 = x² - 9
x² = 1
x = 1 ∨ x = -1
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
1.
|x - 4| ≥ 5
x - 4 ≥ 5 ∨ x - 4 ≤ -5
x ≥ 9 ∨ x ≤ -1
x ∈ (-∞ ; -1> ∪ <9 ; +∞)
2.
|3/4 + 5/4x| < 1/4
3/4 + 5/4x < 1/4 / * 4 ∧ 3/4 + 5/4x > -1/4 / * 4
3 + 5x < 4 ∧ 3 + 5x > -4
5x < 1 / : 5 5x > -7 / : 5
x < 1/5 x > -7/5
x ∈ (-7/5 ; 1/5)
3.
x - 1 ≠ 0
x ≠ 1
-7 / (x - 1) = 8 / * (x - 1)
-7 = 8 * (x - 1)
-7 = 8x - 8
8x = 1 / : 8
x = 1/8
4.
x² - 9 ≠ 0
x² ≠ 9
x ≠ 3 ∨ x ≠ -3
(2x² - 10) / (x² - 9) = 1 / * (x² - 9)
2x² - 10 = x² - 9
x² = 1
x = 1 ∨ x = -1