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(-2x + 1)(x + 3) ≤ 0
x = 1/2 atau x = -3
maka:
-3 ≤ x ≤ 1/2
2x²+5x-3≤0
2x²+5x-3=0
(2x-1)(x+3)=0
x=1/2 atau x=-3
jadi HP={x|x kurang dari sama dengan-3 atau x lebih dari samadengan1/2}