Question

x2-4x-5=0 qual e a resposta

Answer 1

X^2-4X-5=0

a=1
b=-4
c=-5

▲=b^2-4*a*c
▲=(-4^2)-4*1*(-5)
▲=16+20
▲=36

X' = (4+\/"""36)/2
X' = (4+6)/2
X' = 5

X" = (4-6)/2
X" = -2/2
X" = -1