因式分解:a^4+2(a^3)+3(a^2)+2a+1

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因式分解:a^4+2(a^3)+3(a^2)+2a+1
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因式分解:a^4+2(a^3)+3(a^2)+2a+1
因式分解:a^4+2(a^3)+3(a^2)+2a+1

因式分解:a^4+2(a^3)+3(a^2)+2a+1
a^4+2a^3+3a^2+2a+1
=a^4+2a^3+a^2+2a^2+2a+1
=a^2(a^2+2a+1)+2a(a+1)+1
=a^2(a+1)^2+2a(a+1)+1
=[a(a+1)+1]^2
=(a^2+a+1)^2