Répondre :
bonjour
x² + 3 x - 7 = - 3
x² + 3 x - 7 + 3 = 0
x² + 3 x - 4 = 0
Δ = 3 ² - 4 ( 1 * - 4 ) = 9 + 16 = 25
x 1 = ( -3 - √25 ) / 2 = ( - 3 - 5 ) / 2 = - 8 /2 = - 4
x 2 = ( - 3 + √25 ) / 2 = ( - 3 + 5 ) / 2 = 2 / 2 = 1
( x + 4 ) ( x - 1 )
x = - 4 ou + 1