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Verified answer
|2x+3| < 21 - 2|2x+3||2x+3| + 2|2x+3| < 21
3|2x+3| < 21
kuadratkan kedua ruas
3²(2x+3)² < 21²
9(4x² + 12x + 9) < 441
bagi dengan 9
4x² + 12x + 9 < 49
4x² + 12x + 9 - 49 < 0
4x² + 12x - 40 < 0
bagi dengan 4
x² + 3x - 10 < 0
(x + 5)(x - 2) < 0
-5 < x < 2