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Buat batas x pembuat fungsi 0
x-5 = 0
x = 5
x² - x - 6 ≠ 0
(x-3)(x+2) ≠ 0
x ≠ 3 dan x ≠ -2
___-2_____3_____5____
x < -2, misal x = -3
-2 < x < 3 , misal x = 0
3 < x < 5 , misal x = 4
x > 5, misal x = 6
---- -2 +++++3 -----5 ++++
tanda pertidaksamaan ≤ 0 , (ambil negatif)
x < -2 atau 3 < x ≤ 5