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bonjour

( x + 4 )² - x² = 56

( x + 4 - x ) ( x + 4 + x ) = 56

4  ( 2 x + 4 ) = 56

8 x + 16 = 56

8 x = 56 - 16

8 x =  40

x = 5

bonjour

( x+4)²-x²=56

on a une identité remarquable a² - b² = ( a+b ) (a-b )

( x + 4 + x ) ( x + 4 - x ) = 56

(4 + 2x )* 4 = 56

on développe

16 + 8x = 56

8x = 56 - 16

8x = 40

x = 40/8

x = 5

bonne journée

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