Bonjour,
Factoriser les expressions:
x²-81 = (x-9)(x+9)
4 x²-36 = (2x-6)(2x+6)= 4(x-3)(x+3)
16-y²= -(y-4)(y+4)
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Bonjour,
Factoriser les expressions:
x²-81 = (x-9)(x+9)
4 x²-36 = (2x-6)(2x+6)= 4(x-3)(x+3)
16-y²= -(y-4)(y+4)