X2+6x+2=0 Nilai x1 2 + X2 2 + 4x1x2

Kelas 10 Matematika
Bab Persamaan Kuadrat

x² + 6x + 2 = 0
a = 1; b = 6; c = 2

(x1)² + (x2)² + 4 . x1 . x2
= ((x1 + x2)² - 2 x1 . x2 + 4x1 . x2
= ((-b/a)² + 2 . x1 . x2
= (-6/1)² + 2 . c/a
= 36 + 2 . 2/1
= 40