Bonjour,
C = 2 (5x - 1)² + 10x - 2
C = 2 (5x - 1)² + 2 (5x - 1)
C = 2 (5x - 1) (5x - 1) + 2 (5x - 1) * 1
C = 2 (5x - 1) ((5x - 1) + 1)
C = 2 (5x - 1) (5x - 1 + 1)
C = 2 (5x - 1) * 5x
C = 10x (5x - 1)
Bonjour,
C=2(5x-1)2+10x-2
= 2(5x-1)² + 2( 5x-1)
= 2( 5x-1) (5x-1) + 2(5x-1)
= 2(5x-1) ( 5x-1 +1)
= (10x -2) ( 5x)