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Sagot :

VINS

bonsoir

x

x + 10

x ( x + 10) = x² + 10 x

x² + 10 x + 25

= ( x + 5 )²

on prend 1 = 6 ² = 36

on prend - 2 = 3 ² = 9

on veut obtenir 49

( x + 5 )² = 49

( x + 5 )² - 49 = 0

( x + 5 - 7 ) ( x + 5 + 7 ) = 0

( x - 2 ) ( x + 12 ) = 0

x = 2 ou - 12

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