G=(2x+3)(2x+3)4x²+6x+6x+94x²+12x+9H=(x+7)²+(x-2)²(x²+14x+49)+(x²-4x+4)x²+14x+49+x²-4x+42x²+10x+53I=(x+7)²-(x-2)²(x²+14x+49)-(x²-4x+4)x²+14x+49-x²+4x-418x+45
A=21-7x7(3-x)B=3x²-6x+93(x²-2x+3)C=4x-22(2x-1)
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G=(2x+3)(2x+3)
4x²+6x+6x+9
4x²+12x+9
H=(x+7)²+(x-2)²
(x²+14x+49)+(x²-4x+4)
x²+14x+49+x²-4x+4
2x²+10x+53
I=(x+7)²-(x-2)²
(x²+14x+49)-(x²-4x+4)
x²+14x+49-x²+4x-4
18x+45
A=21-7x
7(3-x)
B=3x²-6x+9
3(x²-2x+3)
C=4x-2
2(2x-1)