Question

por favor, me ajude!!

Answer 1

A)x²-5x+6= Use o delta Δ= b²-4ac

Δ=(-5)²-4(1.6)

Δ=25 -24

Δ= 1

X= -b+-√Δ/2a

X=+5+-1/2

X,=+5+1/2

X,=+6/2

X,=3

X,,=+5-1/2

X,,=4/2

X,,=2

B)X²-81

√X²=√81

X=+-9

C) X² +2x-8=0

Δ=2²-4(1(-8)

Δ=4 +32

Δ=36

X=-2+- 6/2

X,= 2+6/2

X,=8/2

X,= 4

X=2-6/2

X,,= -4/2

X,,= -2

D)x²-5x+8=0

Δ=(-5)²-4(1.8

Δ=25-32

Δ=-7 não possui raizes reais (Delta negativo)

E)-x² +6x -5

Δ= 6²-4(-1)-5)

Δ=36 -20

Δ=16

X= -6 -+√16/2.-1

X=-6+-4/-2

X,=-6+4/-2

X,= -2/-2

X,=+1

X= -6-4/-2

X,,=-10/-2

X,,=+5

F)3x² -7x +2=0

Δ=(-7)² -4(3.2)

Δ=49 -24

Δ=25

X= +7+-5/2.3

X=+7+-5/6

X,=+7+5/6

X, = 12/6

X,=2

X=+7 -5/6

X= 2/6

X,,=1/3

G)x²-2x-15

Δ= (-2)²-4(1.(-15)

Δ= 4 +60

Δ=64

X= +2+-8/2

X= 2+8/2

X,=10/2

X,=5

X=+2-8/2

X,,= -6/2

X,,= -3

h)4x²-12X+9=0

Δ=(-12²) -4(4(+9)

Δ=144 -16.9

Δ=144-144

Δ=0

X=+12/4

X=3