Répondre :
bonjour
A = ( 2 x - 1 ) ( x² + 3 )
= 2 x ³ + 6 x - x² - 3
= 2 x ³ - x² + 6 x - 3
(2x-1)(x^2+3)
=(2x×x^2)+(2x×3)-(1×x^2)-(1×3)
=2x^3+6x-x^2-3
=2x^3-x^2+6x-3
bonjour
A = ( 2 x - 1 ) ( x² + 3 )
= 2 x ³ + 6 x - x² - 3
= 2 x ³ - x² + 6 x - 3
(2x-1)(x^2+3)
=(2x×x^2)+(2x×3)-(1×x^2)-(1×3)
=2x^3+6x-x^2-3
=2x^3-x^2+6x-3