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2x² - x - 1 = 0 (difaktorkan)
(2x + 1)(x - 1) = 0
2x + 1 = 0
2x = -1
x₁ = -1/2 (negatif tidak memenuhi)
atau
x - 1 = 0
x₂ = 1
panjang = 1
lebar = 1/2