Question

x2-4x-5
a-1
b-4x
c-5
Qual resultado ?
fiz com a formula de Bhaskara !

Answer 1

X^2-4X-5

a=1
b=-4
c=-5

Δ = b2 - 4.a.c 
Δ = -42 - 4 . 1 . -5 
Δ = 16 - 4. 1 . -5 
Δ = 36

x = (-b +- √Δ)/2a

x'= (-(-4)+-6)/2x1

x'=(4+6)/2 = 

10/2= 5

x"= (-(-4)+-6)/2x1

x"=(4-6)/2 = 

-2/2= -1

Answer 2

x^2-4x-5=0        a= 1 b= -4 c= -5

Δ=b^2-4.a.c
Δ=(-4)^2-4.1.(-5)
Δ=16+20
Δ=36

x= -b+/- (√ de Δ)/2.a
x= -(-4)+/-√36/2.1
x= -4+/-6/2

x1= -4+6/2=2/2=1

x2= -4-6/2= -10/2= -5