Question

será que ALGUEM poderia me ajudar nessas equações de segundo grau por favor ??????​

Answer 1

E) x² – 4x – 12 = 0 =

x² + 2x – 6x – 12 = 0 =

x . ( x + 2 ) – 6x – 12 = 0 =

x . ( x + 2 ) – 6( x + 2 ) = 0 =

( x + 2 ) . ( x – 6 ) = 0 =

x + 2 = 0

x – 6 = 0 =

x = –2

x – 6 = 0 =

x = –2

x = 6 =

x¹ = –2, x² = 6

F) x² – x – 90 = 0 =

x² + 9x – 10x – 90 = 0 =

x . ( x + 9 ) – 10x – 90 = 0 =

x . ( x + 9 ) – 10( x + 9 = 0 =

( x + 9 ) . ( x – 10 ) = 0 =

x + 9 = 0

x – 10 = 0 =

x = –9

x – 10 = 0 =

x = –9

x = 10 =

x¹ = –9, x² = 10

G) –20 = – x – x² =

–20 + x + x² = 0 =

x² + x – 20 = 0 =

x² + 5x – 4x – 20 = 0 =

x . ( x + 5 ) – 4x – 20 = 0

x . ( x + 5 ) – 4( x + 5 ) = 0 =

( x + 5 ) . ( x – 4 ) = 0 =

x + 5 = 0

x – 4 = 0 =

x = –5

x – 4 = 0 =

x = –5

x = 4

x¹ = –5, x² = 4

H) 1 + 12x = 9x² =

1 + 12x – 9x² = 0 =

–9x² + 12x + 1 = 0 =

9x² – 12x – 1 = 0 =

x = –(–12) + ✓( –12 )² – 4 . 9 . ( –1 )

————————————————

2 . 9

x = 12 + ✓( –12 )² – 4 . 9 . ( –1 )

——————————————

2 . 9

x = 12 + ✓144 – 4 . 9 . ( –1 )

———————————–

2 . 9

x = 12 + ✓144 – 36

————————

2 . 9

x = 12 + ✓144 – 36

————————

18

x = 12 + ✓180

—————

18

x = 12 + 6✓5

————-

18

x = 12 + 6✓5

————-

18

x = 12 – 6✓5

————-

18

x = 2 + ✓5

————-

3

x = 12 – 6✓5

————-

18

x = 2 + ✓5

———–

3

x = 2 – ✓5

———–

3

x¹ = 2 – ✓5 x² = 2 + ✓5

———–, ———–—–

3 3

ASS: Blues | 17/08/21 às 17:16

Answer 2

Resposta:

nn sei Dsclp

Explicação:

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