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x=-2√5
subtitusi nilai x:
(x+1)(x-1)
=(-2√5 + 1) (-2√5 -1)
= -4•5 + 2√5 - 2√5 - 1
= 20-1
= 19
x = 3√5 - 5√5
x = -2√5
(x+1)(x-1) = ...???
(x+1)(x-1) = x² - 1
x² - 1 = (-2√5)² - 1
x² - 1 = 4×5 - 1
x² - 1 = 19