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PK a² + 5a + 1= 0
akr PK baru p dan q
p = 5a --> a= p/5 sub ke a² + 5a + 1= 0
(p/5)² + 5(p/5) + 1= 0
1/25 p² + p + 1= 0 atau
p²+ 25p +25 = 0
dalam, x --> x² + 25x + 25 = 0