Question

-2×2+2×+40=0 resolver​

Answer 1

Resposta:

-2x² + 2x + 40 = 0

dividindo td por -2 ,teremos :

x² - x - 20 = 0

x = -(-1)+-√(-1)² - 4(1)(-20)/2(1)

x = 1 +- √1 + 80 / 2

x = 1 +- √81 / 2

x = 1 +- 9 / 2

x' = 1+9/2 = 10/2 = 5

x'' = 1 - 9/2 = -8/2 = -4