Question

Calcule as raízes da equação −x² − 4x + 60 = 0

Answer 1

Δ=(-4)²-4·(-1)·60

  = 16+240

  =256

x=[-(-4)±√256]/2·(-1)

x= (4±16)/ -2

x'= (4+16)/ -2 = 20/ -2 = -10

x"= (4-16)/-2 = -12/ -2 = 6

portando x vale -10 e 6