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1) b²-1
2) c²+ 0.8c+ 0.15
3) x²-2x-3
4) (x+y)²-4( x+y )+3
2) c^2+0.8c+0.15
3) x^2-2x-3
4) x^2+2xy-4x+y^2-4y+3
5) x^6+3x^5-10x^4
6) -9a^2x^2+1
7) -a^4+x^3
8) x^2+2xy+y^2-2^2
9) x^4-25x^2+60x-36