tolong di bantu no 6 dg caranya...

Kelas 10 Matematika
Bab Persamaan Kuadrat

2x² + 4x + 7 = 0
a = 2; b = 4; c = 7

α/b + β/α
= (α² + β²)/(α . β)
= ((α + β)² - 2 . α . β) / (c/a)
= ((-b/a)² - 2 . c/a) / (7/2)
= ((-4/2)² - 2 . 7/2) . 2/7
= (4 - 7) . 2/7
= -6/7