1)
2x²-4x+3 + x²+4x-2 = 3x²+1
2)
-19a^5c² +12a²c^6 + 2a^5c²-17a²c^6= -17a^5c²-5a²c^6
3)
12c³-8bx³ -10c²bx³ - 5c³+9c^2bx³=7c³-c²bc³-86x³=7c³-c²bx³-8bx³
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Answers & Comments
1)
2x²-4x+3 + x²+4x-2 = 3x²+1
2)
-19a^5c² +12a²c^6 + 2a^5c²-17a²c^6= -17a^5c²-5a²c^6
3)
12c³-8bx³ -10c²bx³ - 5c³+9c^2bx³=7c³-c²bc³-86x³=7c³-c²bx³-8bx³