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x² + x² - 2x - 2x - 20 + 4 ≤ 0
2x² - 4x - 16 ≤ 0
x² - 2x - 8 ≤ 0
(x - 4)(x + 2) ≤ 0
batasnya,
x = 4 dan x = - 2
uji nilai x = 0
(0 - 4)(0 + 2) ≤ 0
(-4)(2) ≤ 0
-8 ≤ 0
memenuhi
karena 0 berada di antara -2 dan 4, dan 0 memenuhi syarat, maka :
HP = {x | -2 ≤ x ≤ 4, x∈R}