Réponses

2013-11-01T14:52:00+01:00
A = 49x^2 + 56x + 16 + 81x^2 - 54x + 9
A = 130x^2 + 2x + 25
2013-11-01T14:54:35+01:00
B= 9x(x-9) - (7x+2)²
B= 9x* x- 9x* 9-  7x²+2*7x*2+2², B=9x²-81x-7x²+28x+4,B= 2x²-53x+4
A=(7x+4)²+(9x-3)²
A= (7x²+2*7x*4+4²)- (9x²-2*9x*3+3²), A= 7x²+42x+16+9x²-54x+9, A= 16x²-12x+25