x2 - 7x + 12 kurang dari =0

x² - 7x + 12 ≤ 0
(x - 4)(x - 3) ≤ 0

x - 4 = 0
x = 4

dan

x - 3 = 0
x = 3

+++++++++ 3 ---- 4 ++++++++

HP = {xI 3 ≤ x ≤ 4, x∈R}