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Niljabeurnjabeur
@Niljabeurnjabeur
April 2019
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Je doit factoriser
A=4x²-28x+49
B=9x²-81
s'il vous plet
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nonotata
A =4x²-28x+ 49
identite remarquable (a-b)² = a²-2ab+b²
donc
a = (2x-7)²
b = 9x²-81
identite remarquable
(a-b)(a+b) = a²-b²
donc
b =(3x-7)(3x+7)
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bernardditbidou
Ce sont des IR
4x²-28x+49=(2x-7)² forme (a-b)²
9x²_81= 9(x²-9)=9(x-3)(x+3) forme a²-b²
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identite remarquable (a-b)² = a²-2ab+b²
donc
a = (2x-7)²
b = 9x²-81
identite remarquable
(a-b)(a+b) = a²-b²
donc
b =(3x-7)(3x+7)
4x²-28x+49=(2x-7)² forme (a-b)²
9x²_81= 9(x²-9)=9(x-3)(x+3) forme a²-b²