(a^2 + 2a)^2 + 12(a^2 + 2a) - 45
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Answer:
a^4+16a^2+4a^3+24a-45
Step-by-step explanation:
a^4+4a^2+4a^3+12a^2+24a-45
a^4+16a^2+4a^3+24a-45
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