5a-[a2- {2a (1-a4a2-3a (a2-5a-3)}] - 8a
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Answer: Hi mate!
Step-by-step explanation:
=5a-[a^2-{1-a^4a^2-3a(a^2-5a-3)}]-8a
=5a-[a^2-{1-a^6-3a^3+15a^2+9a}]-8a
=5a-a^2+1-a^6-3a^3+15a^2+9a-8a
=1-a^6-3a^3+14a^2+6a
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