85 Factoriser les expressions suivantes.
1. M = 3x + 21x²
2. A = 13x² + 169
3. T = 35x² - 14x
4. H = 2x(3x + 4) + 2x(x + 3)
1. M = 3x + 21x²
2. A = 13x² + 169
3. T = 35x² - 14x
4. H = 2x(3x + 4) + 2x(x + 3)
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M = 3x + 21x²
M = 3x × ( 1 + 7x )
A = 13x² + 169
A = 13 × ( x² + 13 )
T = 35x² - 14x
T = 7x × ( 5x - 2 )
H = 2x ( 3x + 4 ) + 2x ( x + 3 )
H = 2x × ( 3x + 4 + x + 3 )
H = 2x × ( 4x + 7 )