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4a² -28a +45
2. 9a² - 6a + 12a - 8 =
9a² +6a -8
3. x⁴ - 10x³ +5x³-50x²=
x⁴ - 5x³ -50x²
4. 2p⁴ +3p³q -5p²q² -8p² - 12pq +20q²
5. 1 + 4y -4y -16y²=
1-16y²