Question

resolva as equações de segundo grau
-x²-x+30

x²-4x-5=0

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Answer 1

Resposta:

a) x1= -6

x2= 5

b) x1=5

x2=-2

Explicação passo-a-passo:

a)DELTA= b^2-4×a×c

DELTA=(-1)^2-4×(-1)×30

DELTA=1+120

DELTA=121

DELTA=11

-b+/-Vb^2-4×a×c/2×a

-(-1)+/-11/2×(-1)

1+/-11/-2

x1=1+11/-2

x1=12/-2

x1=-6

x2=1-11/-2

x2=-10/-2

x2=5

b)DELTA= b^2-4×a×c

DELTA=(-4)^2-4×1×(-5)

DELTA=16+20

DELTA=36

DELTA=6

-b+/-Vb^2-4×a×c/2×a

-(-4)+/-6/2×1

4+/-6/2

x1=4+6/2

x1=10/2

x1=5

x2=4-6/2

x2=-4/2

x2=-2