Sagot :

maudmarine

Bonjour

Prouver que (x+1)(3-2x)(x-1)=-2xau cube+3x²+2x-3

(x + 1) (3 - 2x) (x - 1)

= (3x - 2x² + 3 - 2x) (x - 1)

= 3x² - 3x - 2x³ + 2x² + 3x - 3 - 2x² + 2x

= - 2x³  + 3x² + 2x² - 2x² - 3x + 3x + 2x - 3

= - 2x³ + 3x² + 2x - 3

lebangaly630

Réponse:

(x+1)(x-1)(3-2x)= -2x³-+3x²+2x-3

Explications étape par étape:

(a+b)(a-b)=a²-b²

(x+1)(x-1)(3-2x)=(x²-1)(3-2x)

=x²×3-x²×2x-3+2x

=3x²-2x³-3+2x

= -2x³-+3x²+2x-3