tolong dong. materi persamaan kuadrat

Kelas 10 Matematika
Bab Persamaan Kuadrat

x² + 9x - 2 = 0
a = 1; b = 9; c = -2

α²β + αβ²
= αβ (α + β)
= c/a . (-b/a)
= (-2/1) . (-9/1)
= 18