Réponses

2014-02-11T20:57:05+01:00
A)(x-3)² = x²-6x+9
b)(5+3x)²=25+30x+9x²
c)(4-x)(4+x)=4²-x²=16-x²
d)(x-3)(2x+5)=2x²+5x-6x-15=2x²-x-15
e)(x-4)(2x+5)-(3x+2)(5x-4)=2x²+5x-8x-20-(15x²-12x+10x-8)=2x²+5x-8x-20-15x²+12x-10x+8