Réponses

2013-03-23T19:38:41+01:00

Bonjour,

 

(1+4x)²=(8x+1)(2x-3)

1² + 8x + 16x²  =  16x² - 24x + 2x - 3

16x² + 8x + 1  =  16x² - 22x - 3

8x+1 = -22x-3

30x+1 = -3

30x = -4

x = -4/30

x = -2/15

 

:)

  • Utilisateur Brainly
2013-03-23T19:40:03+01:00

(1+4x)²=(8x+1)(2x-3)

(1² + 2*1*4x + 4x²) = (8x*2x + 8x * -3 + 1*2x + -3 *1)

1² + 8x +16x² = 16x² - 24x +2x -3

1 + 8x +16x² = 16x² -22x -3

1 +8x +16x² - 16x² +22x +3 =0

4 + 30x = 0

30x = -4

x = -4/30

x= -2/15