Sagot :
bjr
A) x² + 2x = x*x + 2x
= x*x + 2x
= x(x + 2)
B) 7x(x - 4) + (x-4)²
= 7x(x - 4) + (x - 4)(x - 4)
= 7x(x - 4) + (x - 4)(x - 4)
= (x - 4) (7x + x - 4)
= (x - 4) (8x - 4)
= (x - 4)*4*(2x - 1)
= 4(x - 4)(2x - 1)
C) (x + 1)(2x + 5) - (x + 1)(3x + 4)
= (x + 1)(2x + 5) - (x + 1)(3x + 4)
= (x + 1) [(2x + 5) - (3x + 4)]
= (x + 1) (2x + 5 - 3x - 4)
= (x + 1)(1 - x)
D) 9u² + 3u = 3u*3u + 3u*1
= 3u*3u + 3u*1
= 3u(3u + 1)
E) (2 - t)(3t + 1) + (3t + 1)
= (2 - t)(3t + 1) + (3t + 1)*1
= (2 - t)(3t + 1) + (3t + 1)*1
= (3t + 1) ( 2 - t + 1)
= (3t + 1)(3 - t)
bonjour
A)
x² + 2 x
= x ( x + 2 )
B )
7x(x-4) + ( x-4)²
= (x-4)(x-4+7x)
= (x-4)(8x-4)
= 4 (x-4)( 2x - 1 )
D )
9u² + 3 u
= 3u ( 3u + 1 )
E )
(2-t)(3t+1)+(3t+1)
= (3t+1)(2-t+1)
= (3t+1)(3-t)
C )
(x+1)(2x+5)-(x+1)(3x+4)
= (x+1)(2x+5-3x-4)
= (x+1)(-x + 1)
bonne continuation ☺️