Réponses

2014-01-24T21:06:34+01:00
C= (6x+5)(4x-3)
C= 6x×4x+6x×(-3)+5×4x+5×(-3)
C= 24x²-18x+20x-15
C= 24x²+2x-15

B= x(2x+8)-3x(-6x-2)
B= x×2x+8×x-3x×(-6x)-3x×(-2)
B= 2x²+8x+18x+6x
B= 2x²+32x

A= 3×(-7)+5×2+5×(-1)-6×x-6×8
A= -21+10-5-6x-48
A= -64-6x