bonsoir
tu appliques Pythagore
AC² = BC² - AB ²
AC² = ( x + 7 )² - 5 ²
AC² = x² + 14 x + 49 - 25
AC² = x² + 14 x + 24
si x = 6
AC = 36 + 84 + 24 = 144
BC = ( 6 + 7) = 13
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bonsoir
tu appliques Pythagore
AC² = BC² - AB ²
AC² = ( x + 7 )² - 5 ²
AC² = x² + 14 x + 49 - 25
AC² = x² + 14 x + 24
si x = 6
AC = 36 + 84 + 24 = 144
BC = ( 6 + 7) = 13