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2014-05-06T20:29:48+02:00
Exercice 51

a)
8x + 12
4 (2x + 3)

b)
15x + 10
5 (3x + 2)

c)
30x - 12
6 (5x - 2)

d)
- 7x - 28
-7 (x + 4)

e)
3x² + 6x
3x (x + 2)

f)
16x² + 20x
4x (4x + 5)
2014-05-06T20:34:19+02:00
4
8x+12 = 8*4 +12 = 32+12 = 44

5
15x+10=  15*5 +10 = 75+10  = 85

6
30x-12 = 30*6 -12 = 180-12 = 168

-7
-7x-28 = -7 *-7 -28 = 49-28 = 21

3x
3x²+6x = 3x² *3x  +6x = 9x au cube +6x

4x
16x² +20x = 16x² *4x +20x*4x = 64x au cube +80x²