bonjour
MD² = x² + 36
MC² = ( 13 - x) ² + 6 ² = 169 - 26 x + x² + 36 = x² - 26 x + 205
x² - 13 x + 36 = 0
Δ = 169 - 4 ( 1 * 36) = 169 - 144 = 25
x 1 = ( 13 - 5 ) / 2 = 4
x 2 = ( 13 + 5 ) / 2 = 9
( x - 4 ) ( x - 9 ) = x² - 9 x - 4 x + 36 = x² - 13 x + 36
solutions trouvées au dessus