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Maksuf nya .............Bahasan : Mencari Himpunan Penyelesaian dari PK
Jawaban : x = 2 + 2√2 atau x = 2 - 2√2
Langkah - langkah :
(Melengkapkan kuadrat)
x² - 4x - 4 = 0
x² - 4x = 4
(x - 2)² = 4 + 4
(x - 2)² = 8
x - 2 = +/- √8
x = 2 + √8
x = 2 + 2√2
atau
x = 2 - √8
x = 2 - 2√2