Question

a)x² + 4x - 5 = 0
fórmula de bhaskara ​

Answer 1

Resposta:

a=1

b=4

c=-5

∆=b²-4.a.c

∆=4²-4.1.(-5)

∆=16-4.(-5)

∆=16+20

∆=36

x=b+- ✓∆/2.a

x=4+-✓36/2.1

x=4+-6/2

x'=4+6/2 x"=4-6/2

x'=10/2 x"=-2/2

x'=5 x"=-1

S={ 5 ; -1 }