Question

2x ao quadrado -7x = 15

Answer 1

2x² - 7x = 15

2x² - 7x - 15 = 0

Δ =b² - 4ac

Δ = (-7)² - 4.2.(-15)

Δ = 169

x = -b+/-√Δ/2a

7+/-13/4

x' = 5

x'' = -3/2

valeu?