Question

Preciso de ajuda rápido!!!​

Answer 1

ax ² + bx + c = 0

1.x ² -7x -8 = 0

x ² - 7x - 8 = 0

Δ = (-7) ² -4.1.-8 = 49+32 = 81

x = (7 ± √81) /2.1

x’ = 7+9/2 = 16/2 = 8

x” = 7-9/2 = -2/2 = -1

S={-1,8}