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2x² + x + 5 - 6 = 0
2x² + x - 1 = 0 ,akar akarnya α dan β
a = 2
b = 1
c = -1
.
α+β = -b/a = -¹/₂
α. β = c/a = ⁻¹/₂
.
α²+β² = (α+β)² - 2αβ
α²+β² = (⁻¹/₂)² - 2(-¹/₂)
α²+β² = ¹/₄ + 1
α² +β² = 1 ¹/₄ = ⁵/₄