Question

Qual de (2x ao quadrado-7x+4)

Answer 1

2x² - 7x + 4 = 0

a = 2, b = - 7, c = 4

Δ = b² - 4ac

Δ = (- 7)² - 4 · (2) · (4)

Δ = 49 - 24

Δ = 25

x = - b ± √Δ / 2a

x = - (- 7) ± √25 / 2 · 2

x = 7 ± 5 / 4

x₁ = 3 + 5 / 4 = 8 / 4 = 2

x₂ = 3 - 5 / 4 = - 2 / 4 = - 1/2