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Sagot :

1- (3x-7)²+(x+4)²
    9x²-42x+49+x²+8x+16
    10x²-34x+65

2- 3x²-2x(5-x)+(2x+7)(3-4x)
    3x²-10x+2x²+6x-8x²+21-28x
   -3x²-32x+21

3- (2x-1)(2x+1)-(x-3)(x+2)
    4x²+2x-2x-1-(x²+2x-3x-6)
    4x²+2x-2x-1-x²-2x+3x+6
   3x²+x+5

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