bonjour
a) ( - x + 5)² = ( 2 x + 7)²
( - x + 5)² - ( 2 x + 7)² = 0
( - x + 5 + 2 x + 7) ( - x + 5 - 2 x - 7) = 0
( x + 12) ( - 3 x - 2) = 0
⇔ x = - 12 ou 2/3
b) ( - 2 x + 5)² + 16 = 0
( - 2 x + 5 + 4) ( - 2 x + 5 - 4) = 0
( - 2 x + 9) ( - 2 x + 1) = 0
⇔ x = 9/2 ou 1/2
tu as compris le principe ? continues