1. - (7x²-5x+3)-(7x²-5)=
2. - (3x+1)+(-3x²-3x+1)=
3. - (a+3b)+(3a-3b)=
4. - a²-5ab-b²-(a²+b²)=
5. - (x+y-z)-(x-y)+(x-y+z)=
2. - (3x+1)+(-3x²-3x+1)=
3. - (a+3b)+(3a-3b)=
4. - a²-5ab-b²-(a²+b²)=
5. - (x+y-z)-(x-y)+(x-y+z)=
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Answers & Comments
2.3x+1-3x²-3x+1=2-3x²
3.a+3b+3a-3b=4a
4.a⁴–5ab–b²–a²-b²=a⁴–5ab–a²-2b²
5.x+y–z-x+y+x-y+z=x+y