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x1 + x2 = (√2 +1) + (√2 - 1)
= √2 +1 + √2 - 1
= 2√2
x1 . x2 = (√2 +1) (√2 - 1)
= 2 - 1
= 1
bentuk umum pers kuadrat : x² - (x1 + x2).x + x1 . x2 = 0
x² - (2√2)x + 1 = 0
jadi persamaan yang dimaksud adalah : x² - (2√2)x + 1 = 0