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(x - 1)(x - 2) ≤ 0
x = 1 atau x = 2
Garis bilangan
+++ [1] --- [2] +++
1 ≤ x ≤ 2
2) x^2 - 9x + 20 ≥ 0
(x - 4)(x - 5) ≥ 0
x = 4 atau x = 5
Garis bilangan
+++ [4] --- [5] +++
x ≤ 4 atau x ≥ 5
3) -x^2 + 15x + 56 ≤ 0
x^2 - 15x - 56 ≥ 0
Tak bisa difaktorin, harus pakai rumus ABC