Question

Calcule o descriminante (Δ) de: 3x²-9x-2=0

Answer 1

$\Delta = b^2-4ac\\ \\ \Delta=(-9)^2-4.9.(-2)=81+72=153$

Answer 2

Δ = b² - 4ac

a = 3 / b = -9 / c = -2

Δ = b² - 4ac ⇒ (-9)² - 4 × 3 × (-2)
Δ = 81 - 4 × 3 × (-2)
Δ = 81 - 4 × (-6)
Δ = 81 + 24
Δ = 105