Pake cara ya mas/mba..

x²+4x-5 ≤ 0
(x + 5)(x - 1) ≤ 0

x = -5
x = 0

+++++++ -5 -------- 1 +++++++

-5 ≤ x ≤ 1
HP = {-5, -4, -3, -2, -1, 0, 1}