bonjour
A=x²-4+ (x+2)(x+3)
= ( x - 2 ) ( x + 2 ) + ( x + 2 ) ( x + 3 )
= ( x +2 ) ( x - 2 + x + 3 )
= ( x + 2 ) ( 2 x + 1 )
B = x² +6x+9− (x+3)(x − 1)
= ( x + 3 )² - ( x + 3 ) ( x - 1 )
= ( x + 3 ) ( x + 3 - x + 1 )
= 4 ( x + 3 )
C = (3x-2)(x+5) +9x² - 4
= ( 3 x - 2 ) ( x + 5 ) + ( 3 x - 2 ) ( 3 x + 2 )
= ( 3 x - 2 ) ( x + 5 + 3 x + 2 )
= ( 3 x - 2 ) ( 4 x + 7 )
D=9x² −1+(3x + 1)(2x + 3)
= ( 3 x - 1 ) ( 3 x + 1 ) + ( 3 x + 1 ) ( 2 x+ 3 )
= (3 x + 1 ) ( 3 x - 1 + 2 x + 3 )
= ( 3 x + 1 ) ( 5 x + 2 )
E = x² - 4x + 4+ (x+3)(x - 2)
= ( x - 2 )² + ( x + 3 ) ( x - 2 )
= ( x - 2 ) ( x - 2 + x + 3 )
= ( x - 2 ) ( 2 x + 1 )
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bonjour
A=x²-4+ (x+2)(x+3)
= ( x - 2 ) ( x + 2 ) + ( x + 2 ) ( x + 3 )
= ( x +2 ) ( x - 2 + x + 3 )
= ( x + 2 ) ( 2 x + 1 )
B = x² +6x+9− (x+3)(x − 1)
= ( x + 3 )² - ( x + 3 ) ( x - 1 )
= ( x + 3 ) ( x + 3 - x + 1 )
= 4 ( x + 3 )
C = (3x-2)(x+5) +9x² - 4
= ( 3 x - 2 ) ( x + 5 ) + ( 3 x - 2 ) ( 3 x + 2 )
= ( 3 x - 2 ) ( x + 5 + 3 x + 2 )
= ( 3 x - 2 ) ( 4 x + 7 )
D=9x² −1+(3x + 1)(2x + 3)
= ( 3 x - 1 ) ( 3 x + 1 ) + ( 3 x + 1 ) ( 2 x+ 3 )
= (3 x + 1 ) ( 3 x - 1 + 2 x + 3 )
= ( 3 x + 1 ) ( 5 x + 2 )
E = x² - 4x + 4+ (x+3)(x - 2)
= ( x - 2 )² + ( x + 3 ) ( x - 2 )
= ( x - 2 ) ( x - 2 + x + 3 )
= ( x - 2 ) ( 2 x + 1 )