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Sagot :

VINS

bonsoir

( x+ 5 )² - 25 = 39

x² + 10 x + 25 - 25 = 39

x² + 10 x = 39

x² + 10 x - 39 = 0

Δ = 10 ² - 4  ( 1 * - 39 ) = 100 + 156 = 256

x1 = ( - 10 - √Δ) / 2 = ( - 10 - 16 ) /2 = - 26 /2 = - 13

x 2 = ( - 10 + √Δ) / 2 = ( - 10 + 16 ) /2 = 6 /2 = 3

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