Respuestas

  • Usuario de Brainly
2013-03-08T21:08:09+01:00

1) x² - 49 =0

x² = 49

x = √49

x1=7............x2= - 7

 

2) (x+5)/10 = (2x-3)/(12-x)

(x +5) (12-x) = (2x - 3)(10)

12x - x² + 60- 5x = 20x - 30

12x - x² + 60 - 5x - 20x + 30 = 0

- x² - 13x + 90 = 0

x1 = - 5............x2= 18

 

3)14x² -13x-12=0

x1 = 1,53.............x2=-0,60

 

4)x² - 2[3x-6+x-2] =0

x² - 6x + 12 -2x + 4 = 0

x² - 8x + 16 = 0

x1=4.............x2=4

 

5)2x² -19x =10

2x² - 19x - 10 = 0

x1= 10.................x2= -1/2

 

6) 4x² +2x-1=10(x+1)

4x² + 2x - 1 - 10x - 1= 0

4x² - 8x - 2 = 0

x1 =2,22........x2= - 0,22

 

7) x² = (2-x)/6

6x² = 2 -x

6x² - 2 + x = 0

6x² + x - 2 = 0 

x1= 1/2.............x2=-2/3

 

8) 2u² - u - 3= 0

u1= 1,5..........u2 =- 1   espero que te sirva, salu2!!!