Bonjour je galere pour ces 3 exo aidez moi !

Exercice 22 :

A =(a +1)²  
A =a² + 2a + 1²  
A =a² + 2a + 1  


B = (5x + 2)²   
B = (5x)² + (2 * 5x * 2) + (2)² 
B = 25x² + 20x + 4 


C = (3y - 4)²  
C = (3y)² - (2 * 3y * 4) + (4)²  
C = 9y² - 24y + 16 


D = (4 - x)²
D = (4)² -(2 * 4 * x)+ (x)²
D = 16 - 8x + x²

A=63x-21-27xcarré+9x
=72x-21-27xcarré
B=-8+16y-12y+24y
=-8+4y+24ycarré
C=-12a-20acarre-18-30a
=-42a-20acarré-18
D=40zcarré+10z-56z-14
=40zcarré-46z-14