x=-1 y=5. Then find=2x^3y-8x^2+3xy+6y
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2x^3y-8x^2+3xy+6y
2 (-1)^3 (5)-8 (-1)^2+3 (-1)(5)+6 (5)
-2×15+8×2-15+30
-30+16-15+30
16-15
=1
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