Question

alguém me ajuda pelo amor de DEUS??????​

Answer 1

Resposta:

1)a=1

b=-5

c=6

∆=(b)²-4.a.c

∆=(-5)²-4.1.6

∆=25-24

∆=1

-(b)+/-√∆÷2.a

-(-5)+/-√1÷2.1

5+/-1÷2

x1=5+1÷2=6℅2=3

x2=5-1÷2=4÷2=2

2)a=1

b=-8

c=12

∆=(b)² -4•a•c

∆ =(-8)²-4•1•12

∆=64-48

∆=16

-(b) +/-√∆/2•a

-(-8)+/-√16/2•1

8+ou-4 /2

x1=8+4/2=12/2=6

x2=8-4/2=4/2=2

3)a=1

b=2

c=-8

∆=(b)²-4.a.c

∆=(2)²-4.1.-8

∆=4--32

∆=4+32

∆=36

-(b)+/-√∆/2.a

-(2)+/-√36/2.1

-2+/-6/2

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

x2=-2-6/2=-8/2=-4

4)a=1

b=-5

c=8

∆=(b)²-4.a.c

∆=(-5)²-4.1.8

∆=25-32

∆=-7

-(b)+/-√∆/2.a

-(-5)+/-√-7/2.1

-7 não tem raiz quadrada por que e negativo

5)a=2

b=-8

c=8

∆=(-8)²-4.2.8

∆=64-64

∆=0

-(-8)+/-√0/2.2

8+/-0/4

x1=8+0/4=8/4=2

x2=8-0/4=8/4=2

6)a=1

b=-4

c=-5

∆=(-4)²-4.1.-5

∆=16--20

∆=16+20

∆=36

-(-4)+/-√36/2.1

4+/-6/2

x1=4+6/2=10/2=5

x2=4-6/2=-2/2=-1