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exercice 3
 a =(x+3)(x-1)+3x(2x-3)=
x²-x+3x-3+6x²-9x=7x²-7x-3

b=(4x-3)²-4=16x²-24x+9-4=16x²-24x+5

c= (3x+2)*(x+4)²=(3x+2)*(x²+8x+16)=3x au cube +24x²+48x+2x²+16x+32=3x au cube +26x²+64x+32

A
[tex]x {}^{2} - x + 3x - 3 + 6x {}^{2} - 9x \\ = 7x {}^{2} - 7x - 3[/tex]
B
[tex]16x {}^{2} - 24x + 9 - 4 \\ = 16x {}^{2} - 24x + 5[/tex]
C
[tex](3x + 2)(x {}^{2} + 8x + 16) \\ = 3x {}^{3} + 24x {}^{2} + 48x + 2x {}^{2} + 16x + 32 \\ = 3x {}^{3} + 26x {}^{2} + 64x + 32[/tex]
2
D=
[tex](x + 2)(3x - 1 - 4x - 1) \\ (x + 2)( - x - 2)[/tex]
E
[tex](x - 1) {}^{2} - 3 { }^{2} \\ = (x - 1 - 3)(x - 1 + 3) \\ =( x - 4)(x + 2)[/tex]