Question

-x^2-x+30=0 me ajudem pfv

Answer 1

- x² - x + 30 = 0
Δ = (-1)² - 4 * (-1) * 30
Δ = 1 + 120
Δ = 121

x = -(-1) +-√121 / 2.(-1)
x' = 1 + 11 / - 2
x' = 12 / - 2
x' = - 6

x" = 1 - 11 / - 2 
x" = - 10 / - 2 
x" = 5 
S = {-6, 5}