Question

5X²-X-4=8 RESPOSTA CURTA PORFAVOR

Answer 1

5X²-X-4=8

5X²-x-12=0

Δ = b²-4ac

Δ = (-1)² - 4.1.(-12)

Δ = 1+48

Δ = 49

x = (-b+/-√Δ)/2a

x = (-(-1)+/-√49)/2.5

x = (1+/-7)/10

x' = 8/10 = 4/5

x" = -6/10 = -3/5