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syarat :
( x - 5) (x - 4) ≠ 0
x ≠ 5 dan x ≠ 4
pembuat fungsi 0 : x² - 5x - 36 = 0
(x - 9) (x+4 ) = 0
x = 9 dan x = -4
____ -4____4_____5____9____
x= -5 -->
x = 0 -->
x= 4,5 --->
x = 6 -->
x= 10 --->
+++ -4 ---- 4 +++++ 5 ----- 9 ++++
tanda ≤ 0 (ambil batasan negatif)
HP { -4 ≤ x < 4 atau 5 < x ≤ 9}