Answer:
1.(12x⁴)(3x6)
=36x¹0
2. (8x⁴y5)(9xy³)
=72x⁴y³
3. 7a(-5a-8)
=-35a²-56a
4. 2t(t²-4x+8)
=2t²-8tx+16t
5. 6v²(2v²+4v+3)
= 12v⁴+24v²+18v²
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