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Sagot :

PAMC

Bonsoir,

1. On a: •identité remarquable: (a+b)(a-b)=a²-b²

(4x+5)(4x-5)=4²x²-5²=16x²-25

2. 9x²-1=1(9x²-1)

VINS

bonsoir,

( 4 x + 5 ) ( 4 x - 5 ) = 16 x² - 25

9 x² - 1 = ( 3 x - 1 ) ( 3 x + 1 )

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