(X²+3X-1)+(-2X+3)
(-AB²+AB-4)+(2AB²-AB-5)
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(-X³-3X²+X)- 3 (X³+2X²)
(A³+2A²-5)-(A³-A²-5)
1)x²+3x-1+(-2x+3)=
x²+3x-1-2x+3=
x²+x+2
(-ab²+ab-4)+(2ab²-ab-5)=
-ab²+ab-4+2ab²-ab-5=
ab²-9
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Verified answer
1)x²+3x-1+(-2x+3)=
x²+3x-1-2x+3=
x²+x+2
(-ab²+ab-4)+(2ab²-ab-5)=
-ab²+ab-4+2ab²-ab-5=
ab²-9