|7 – 3x| ≤ |11 – 5x|
|7 – 3x| ≤ |11 – 5x|
Jawab:
|7 – 3x| ≤ |11 – 5x|
|7 – 3x|² ≤ |11 – 5x|²
9x² – 42x + 49 ≤ 25x² – 110x + 121
25x² – 110x + 121 – 9x² + 42x – 49 ≥ 0
16x² – 68x + 72 ≥ 0
4x² – 17x + 18 ≥ 0
(4x – 9) (x – 2) ≥ 0
x = 9/4 atau x = 2
Hp {x ≤ 2 atau x ≥ 9/4}
Jawab:
|7 – 3x| ≤ |11 – 5x|
|7 – 3x|² ≤ |11 – 5x|²
9x² – 42x + 49 ≤ 25x² – 110x + 121
25x² – 110x + 121 – 9x² + 42x – 49 ≥ 0
16x² – 68x + 72 ≥ 0
4x² – 17x + 18 ≥ 0
(4x – 9) (x – 2) ≥ 0
x = 9/4 atau x = 2
Hp {x ≤ 2 atau x ≥ 9/4}
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