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p² + 10/4p - 2 = 0 ⇒ bagi kedua ruas dengan 4
p² + 5/2p = 2
(p + 5/4)² - 25/16 = 2
(p + 5/4)² = 2 + 25/16
(p + 5/4)² = 32/16 + 25/16
(p + 5/4)² = 57/16
p + 5/4 = + √57/16
p = + √57/16 - 5/4
Atau bisa dengan rumus kecap:
x = (-b + √b² - 4ac) : (2a)