Question

x² - 19/15 x + 2/5 =0

Answer 1

Resposta:

V = {x ∈ |R/ x = 4/3 ou x = 6/5}

Explicação passo-a-passo:

x² - 19/15x + 2/5 = 0        a = 1         b = -19/15       c = 2/5

Δ = b² - 4ac

Δ = (-19/15)² - 4.1 (2/5)

Δ = 361/225 - 8/5          mmc(225,5) = 225

Δ = 1.361 - 45.8  

         225

Δ = 361 - 360

         225

Δ =   1    

      225

x = -b +-√Δ /2a

x = -(-19/15) +- √1/225/2.1

x = 19/15 +- 1/15/2

x' = 19/15 + 1/15/2 = 20/15 (:5) = 4/3

x" = 19/15 - 1/15/2 = 18/15 (:3) = 6/5

Answer 2

Resposta:

X"=6/5 valeu blz então;)