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2p²-12p = 15
----------------- : 2
p²-6p = 15/2
p²-6p+3² = 15/2 + 3²
(p-3)² = 15/2 + 9
(p-3)² = 33/ 2
p-3 = √33/2 atau p-3 = -√33/2
p = 3+√33/2 p = 3 - √33/2
= 3 + 4,06 p = 3 - 4,06
= 7,06 = -1,06
= 7,1 = -1,1