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Verified answer
Bab Persamaan KuadratMatematika SMP Kelas VIII
2x² + 6x - 1 = 0
a = 2; b = 6; c = -1
x₁² + x₂²
= (x₁ + x₂)² - 2 . x₁ . x₂
= (-b/a)² - 2 . c/a
= (-6/2)² - 2 . (-1/2)
= 9 + 1
= 10
jawabannya E
Verified answer
(x1)^2 + (x2)^2= (x1 + x2)^2 - 2(x1.x2)
2x^2 + 6x - 1 = 0
x1 + x2
= -b/a
= - (6) / 2
= - 3
x1 . x2
= c / a
= - 1 / 2
= - 1/2
-->
(x1 + x2)^2 - 2(x1.x2)
(-3)^2 - 2 (-1/2)
9 + 1
= 10