Bonjour,
identités remarquables...
(a-b)²=a²-2ab+b² donc : (3x-1)² = 9x²-6x+1
(a+b)(a-b) = a²-b² donc : (5x+4)(5x-4) = (5x)²-4² = 25x²-16
C = (3 – 1)²
( a-b)²
= 9 -6+1 = 4
D= (5x + 4)(5x – 4)
(a-b) ( a+b)
= 25x² -20x +20x -16
= 25x² -16
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Bonjour,
identités remarquables...
(a-b)²=a²-2ab+b² donc : (3x-1)² = 9x²-6x+1
(a+b)(a-b) = a²-b² donc : (5x+4)(5x-4) = (5x)²-4² = 25x²-16
Bonjour,
C = (3 – 1)²
( a-b)²
= 9 -6+1 = 4
D= (5x + 4)(5x – 4)
(a-b) ( a+b)
= 25x² -20x +20x -16
= 25x² -16