Question

Resolva as equaçoes do 2 grau

a-4x²-4x-8=0
b-x²+4x-5=0
c=x²-18x-19=0
d=x²+10x+9=0
e=x²-4x-96=0
f=x²-2x-48=0

Answer 1

Resposta:

OLÁ, boa tarde.

Explicação passo-a-passo:

a)- 4x^2-4x-8=0

divide por 4 para simplificar

x^2-x-2=0

Δ= b^2-4.a.c

Δ= 1+8

Δ=9

-b+-√Δ/2

-(-4)-+√9/2

4-+3/2

x1=7/2

x2=1/2

b)- x²+4x-5=0

Δ= 4²-4.1.(-5)

Δ=16+20

Δ=36

-b-+√Δ/2

-4-+√36/2

-4-+6/2

x1=-5

x2=1

c)- x²-18x-19=0

Δ=18²-4.1.-19

Δ=324+76

Δ=400

-b-+√Δ/2

18-+√400/2

18+-20/2

x1=19

x2=-1

d)-x²+10x+9=0

Δ=10²-4.1.9

Δ=100-36

Δ=64

-b-+√Δ/2

-10-+√64/2

-10-+8/2

x1=-9

x2=-1

e)-x²-4x-96=0

Δ=-4²-4.1.-96

Δ=16+384

Δ=400

-b-+√Δ/2

-(-4)-+√400/2

4-+20/2

x1=12

x2=-8

f)-x²-2x-48=0

Δ=-2²-4.1.-48

Δ=4+192

Δ=196

-b-+√Δ/2

-(-2)-+√196/2

2-+14/2

x1=8

x2=-6

Espero ter ajudado!!