Answer:
1. 3x³+7x²–5 + 2x²+3x+8
= 3x³+9x²+3x+3
3x³+9x²+3x+3 – 5x²+x-5
= 3x³+4x²+4x-2
2. 3x³+4x²-7 – 4x³+x²+5
= x³-3x²+12
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Answers & Comments
Answer:
1. 3x³+7x²–5 + 2x²+3x+8
= 3x³+9x²+3x+3
3x³+9x²+3x+3 – 5x²+x-5
= 3x³+4x²+4x-2
2. 3x³+4x²-7 – 4x³+x²+5
= x³-3x²+12