Bonjour;
1. 7x + 21
=7( x+3)
2. 24x²-12x
= 12x ( 2x -x)
3. 5(x + 1) + x(x + 1).
= (x+1) ( 5 +x)
4. 3(x-2)(x - 5) + (x - 5)².
= (x-5) ( 3x -6 +x-5)
= (x-5) ( 4x -11)
À l'aide des identités remarquables, factoriser les expressions suivantes
5. x² +10x + 25.
=(x +5)²
6. 9x²-6x+ 1.
= (3x-1)²
7. 25x² - 81.
=(5x -9)(5x+9)
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Bonjour;
1. 7x + 21
=7( x+3)
2. 24x²-12x
= 12x ( 2x -x)
3. 5(x + 1) + x(x + 1).
= (x+1) ( 5 +x)
4. 3(x-2)(x - 5) + (x - 5)².
= (x-5) ( 3x -6 +x-5)
= (x-5) ( 4x -11)
À l'aide des identités remarquables, factoriser les expressions suivantes
5. x² +10x + 25.
=(x +5)²
6. 9x²-6x+ 1.
= (3x-1)²
7. 25x² - 81.
=(5x -9)(5x+9)