bonsoir
1) devlopper et réduire :
a=2×(x-4)
= 2 x - 8
b=(2x-3)(3x-2)
= 6 x² - 4 x - 9 x + 6
= 6 x² - 5 x + 6
c=(x+3)² = x² + 6 x + 9
d=(2x-5)² = 4 x² - 20 x + 25
e=(x+7)(x-7) = x² - 49
2) factoriser:
f=x²-3x = x ( x - 3 )
g=4x-8y = 4 ( x - 2 y )
h=x²-25 = ( x - 5 ) ( x + 5 )
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bonsoir
1) devlopper et réduire :
a=2×(x-4)
= 2 x - 8
b=(2x-3)(3x-2)
= 6 x² - 4 x - 9 x + 6
= 6 x² - 5 x + 6
c=(x+3)² = x² + 6 x + 9
d=(2x-5)² = 4 x² - 20 x + 25
e=(x+7)(x-7) = x² - 49
2) factoriser:
f=x²-3x = x ( x - 3 )
g=4x-8y = 4 ( x - 2 y )
h=x²-25 = ( x - 5 ) ( x + 5 )