Developpe A=x(x+4) B=7y (2-9y) C=-2y (5-y) D=(9-3t) x4t Developpe et reduis les e xpressions suivantes A=(7-3x)(9x-3) B=(-2-3y)(4-8y) C=(4a+6)(-3-5a) D=(5z-7)(8

A = x ( x + 4 ) 
A = x² + 4x

B = 7y ( 2 - 9y ) 
B = 14y - 63y²

C = - 2y ( 5 - y )
C = - 10y + 2y²

D = ( 9 - 3t ) × 4t
D = 36t - 12t²

A = ( 7 - 3x ) ( 9x - 3 )
A = 63x - 21 - 27x² + 9x
A = - 27x² + 72x - 21 

B = ( - 2 - 3y ) ( 4 - 8y )
B = - 8 - 12y + 16y + 24y²
B = 24y² + 4y - 8 

C = ( 4a + 6 ) ( - 3 - 5a )
C = - 12a - 18 - 20a² - 30a
C = - 20a² - 42a - 18

D = ( 5z - 7 ) ( 8z + 2 ) 
D = 40z² - 56z + 10z - 14
D = 40z² - 46z - 14