Sagot :

Pamc

Bonjour,

Rappels: •(a+b)(c+d)=ac+ad+bc+bd

•a(b+c)=ab+ac

A=4(6+z)+(z-3)(2-z)

A=24+4z+2z-z²-6+3z

A=-z²+9z+18

Ce calcul vaut -z²+9z+18.

katlyn086
=4x6+4xz+zx2-zxz-3x2+3xz
=24+4z+2z-z^2-6+3z
=-z^2+9z+18