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a = (x +2) ( x + 4 + x - 3)
a = ( x + 2) ( 2 x + 1)

b =  3² - x²

c = ( x - 4) ( x + 1 - x + 4)
c = ( x - 4) ( 5)

d = (x - 5)²

e = (2 x + 9)²

F = ( 4 - 2 x) ( 4 - 2 x + 4 + 2 x)
F = ( 4 - 2 x ) ( 8)

Exercice 2 :

A = (x + 4) (x + 2) + (x + 2) (x - 3)
A = (x + 2) [(x + 4) + (x - 3)]
A = (x + 2) (x + 4 + x - 3)
A = (x + 2) (2x + 1)

B = (3 + x) (3 - x)
B = 3² - x²

C = (x + 1) (x - 4) - (x - 4)²
C = (x - 4) [(x + 1) - (x - 4)]
C = (x - 4) (x + 1 - x + 4)
C = (x - 4) * 5

D = x² - 10x + 25
D = x² - 2 * 5 * x + 5²
D = (x - 5)²

E = 81 + 36x + 4x²
E = 9² + 2 * 18 * x + (2x)²
E = (2x + 9)²

F = (4 - 2x)² + (4 - 2x) (4 + 2x)
F = (4 - 2x) [(4 - 2x) + (4 + 2x)]
F = (4 - 2x) (4 - 2x + 4 + 2x)
F = (4 - 2x) * 8