Bonsoir pourriez vous m’aider svp

Bonsoir,

___________
A=(x+3)(2x+5)
=2x²+5x+6x+15
=2x²+11x+15.
_____________
B=(5+4x)(6+x)
=30+5x+24x+4x²
=4x²+29x+30.
_____
C=(1-3x)(4+5x)
=4+5x-12x-15x²
=-15x²-7x+4
_______________
:)

Bonsoir,

A=(x+3)(2x+5)
A=2x^2+5x+6x+15
A=2x^2+11x+15

B=(5+4x)(6+x)
B=30+5x+24x+4x^2
B=4x^2+29x+30

C=(1-3x)(4+5x)
C=4+5x-12x-15x^2
C=-15x^2-7x+4

bon courage !