Question

10)encontre os valores de x na equaçao x²-6x+5
11)encontre os valores de x na equaçao 3x²-4x
13)Encontre os valores de x na equaçao -x²+2x+8

Answer 1

10) x^2-6x+5=0
delta=b^2-4ac
delta=(-6)^2-4.1.5
delta=36-20
delta=16
x=-b-/+ raiz de delta/2a
x=-(-6)-4/2.1
x=6-4/2
x=2/2
x=1
x=-(-6)+4/2.1
x=6+4/2
x=10/2
x=5
11) 3x^2-4x=0
delta=b^2-4ac
delta=(-4)^2-4.3.0
delta=16-0
delta=16
x=-b-/+ raiz de delta/2a
x=-(-4)-4/2.3
x=4-4/6
x=0/6
x=0
x=-(-4)+4/2.3
x=4+4/6
x=8/6 (:2)
x=4/3
13) -x^2+2x+8=0
delta=b^2-4ac
delta=2^2-4.(-1).8
delta=4+32
delta=36
x=-b-/+ raiz de delta/2a
x=-2-6/2.(-1)
x=-8/-2
x=4
x=-2+6/2.(-1)
x=4/-2
x=-2

Answer 2

Resposta:

Explicação passo-a-passo:

10) x^2-6x+5=0

delta=b^2-4ac

delta=(-6)^2-4.1.5

delta=36-20

delta=16

x=-b-/+ raiz de delta/2a

x=-(-6)-4/2.1

x=6-4/2

x=2/2

x=1

x=-(-6)+4/2.1

x=6+4/2

x=10/2

x=5

11) 3x^2-4x=0

delta=b^2-4ac

delta=(-4)^2-4.3.0

delta=16-0

delta=16

x=-b-/+ raiz de delta/2a

x=-(-4)-4/2.3

x=4-4/6

x=0/6

x=0

x=-(-4)+4/2.3

x=4+4/6

x=8/6 (:2)

x=4/3

13) -x^2+2x+8=0

delta=b^2-4ac

delta=2^2-4.(-1).8

delta=4+32

delta=36

x=-b-/+ raiz de delta/2a

x=-2-6/2.(-1)

x=-8/-2

x=4

x=-2+6/2.(-1)

x=4/-2

x=-2