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Verified answer
MatematikaPertidaksamaan Mutlak X SMA
Pembahasan :
|2x + 1| < 7
(2x + 1)² < 7²
(2x + 1)² - 7² < 0
(2x + 1 + 7)(2x + 1 - 7) < 0
(2x + 8)(2x - 6) < 0
-4 < x < 3
Hp : {-4 < x < 3}
Verified answer
|2x + 1| < 72x + 1 < 7
2x < 7 - 1
2x < 6
x < 6/2
x < 3
-|2x + 1| < 7
|2x + 1| > 7/-1
2x + 1 > -7
2x > -7 - 1
2x > -8
x > -8/2
x > -4
Jadi HPnya adalah {-4 < x < 3}