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A.x2+1 | B.-1+x2 | C.-x2-y2 | D.x2+4x+4 |
A.4a2-4a+1=4a(a-1)+1 | B.a2-4b2=(a+4b)(a-4b) |
C.x2+2xy+4y2=(x+2y)2 | D.(xy)2-1=(xy+1)(xy-1) |
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A.x2+5x-1=x(x+5)-1 | B.x2-4+3x=(x+2)(x-2)+3x |
C.x2-9=(x+3)(x-3) | D.(x+2)(x-2)=x2-4 |
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