5. Subtract 3t⁴ – 4 t³ + 2t² – 6t + 7 from - 4t⁴ +8t³ – 4t²-3t +12 .
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=(-4t⁴+8t³-4t²-3t+12)-(3t⁴-4t³+2t²-6t+7)
= -4t⁴+8t³-4t²-3t+12-3t⁴+4t³-3t²+6t-7
= -4t⁴-3t⁴+8t³+4t³-4t²-3t²-3t+6t+12-7
= -7t⁴+12t³-7t²+3t+5
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