1) (2x+3)² -(5x-4)(5x+4)=(x+5)²+(3x-1)(7x+2)-(x²-1+1) 2) (1-3x)² -(x-2)(9x+1)=(3x-4)(3x+4)-9(x+3)² 3) (3x+4)(3x-4)-(2x+5)²=(x-5)²+(2x+1)²-(x²-2x)+(x-1)² 4) (x-1)(x+1)-(x-3)²=(3x-5)(3x+5)-(3x+1)²+(x-2)²-x ²

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