Răspuns :

Mariaalexa34id

2x + 2 = 6 / - 2

2x = 4 / : 2 => x = 2

6 = 4x + 4 - 2x - 4

2x + 0 = 6 / - 0

2x = 6 / : 2 => x = 3

9x - 18 = - 63 / + 18

9x = - 45 / 9 => x = - 5

8x + 2 = 10x - 14

8x - 10x = 2 + 14

- 2x = 16 / ( - 2 ) => x = - 8

1 - 4 * ( - 5x + 10 ) = 21

1 + 20x - 40 = 21

20x - 39 = 21 / + 39

20x = 60 / : 20 => x = 3

x² - 21 = 0 / + 21

x² = 21 => x =

[tex] \sqrt{21} [/tex]

Sper că te-am ajutat, dar la ultimul nu cred că am făcut bine.. Succes!

Acesta este rezultatul la ultimul

2(x+1)=6

x+1=3

x=3-1

X=2

6=4(x+1)-2(x+2)

6=4x+4-2x-4

6=2x

x=3

9(x-2)=-63

x+2=7

x=-7-2

x=-9

2(4x+1)=2(5x-7)

4x+1=5x-7

4x-5x=7-1

-x=-8

X=8

1-4•[-5•(x-2)]=21

1-4×(-5x+10) = 21

1-4×(-5x+10) = 21-4(-5x+10) = 21-1

1-4×(-5x+10) = 21-4(-5x+10) = 21-120x-40 = 20

1-4×(-5x+10) = 21-4(-5x+10) = 21-120x-40 = 2020x = 20+40

1-4×(-5x+10) = 21-4(-5x+10) = 21-120x-40 = 2020x = 20+4020x = 60

1-4×(-5x+10) = 21-4(-5x+10) = 21-120x-40 = 2020x = 20+4020x = 60x = 60/20

1-4×(-5x+10) = 21-4(-5x+10) = 21-120x-40 = 2020x = 20+4020x = 60x = 60/20x = 3

(x+3)(x-7)=0

x+3=0

x-7=0

x=-3

x=7

la rezultat pun o poza sus

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