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buat batasan x pembuat fungsi 0
(x+7)(x+4) = 0
x = -7 dan x = -4
____-7_____-4_____
uji bilangan '0' disebelah kanan -4 ke pertidaksamaan
0²+11(0)+28 = 28 --> + positif
++++ -7 ----- -4 ++++
tanda ≤ 0, ambil batasan - (negatif)
-7 ≤ x ≤ -4