|7x – 6| ≥ 9
|7x – 6| ≥ 9
Jawab:
|7x – 6| ≥ 9
|7x – 6|² ≥ 9²
49x² – 84x + 36 ≥ 81
49x² – 84x + 36 – 81 ≥ 0
49x² – 84x – 45 ≥ 0
(7x – 15) (7x + 3) ≥ 0
x = 15/7 atau x = -3/7
Hp = { x ≤ -3/7 atau x ≥ 15/7}
Jawab:
|7x – 6| ≥ 9
|7x – 6|² ≥ 9²
49x² – 84x + 36 ≥ 81
49x² – 84x + 36 – 81 ≥ 0
49x² – 84x – 45 ≥ 0
(7x – 15) (7x + 3) ≥ 0
x = 15/7 atau x = -3/7
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