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akar-akar nyata jika d>=0
(2p+4)² -4 .2 . (5p-2)≥0
4p²+16p+16-40p +16≥0
4p² -24p+32≥0
p²-6p+8≥0 .... (p-4)(p-2)≥0
++++++++0------2+++++++4--------
jaddi x≤0 2≤x≤4