a(a+4)+3a(2a²-1)+4a²+4 at a=-2
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=2a²+3a (1-2a³) +a (a+1)
=2a²+3a-6a⁴+a²+a
=-6a⁴+3a²+4a
Answered by @sharmaabhijeet137
Hope this'll help you
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