Bantu jawab pake cara

Bab Persamaan Kuadrat
Matematika 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

(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