Evaluate
a^{2}\left(4a^{2}-2a+1\right)
Expand
4a^{4}-2a^{3}+a^{2}
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\left(4a^{3}-2a^{2}+a\right)a
Divide each term of 28a^{3}-14a^{2}+7a by 7 to get 4a^{3}-2a^{2}+a.
4a^{4}-2a^{3}+a^{2}
Use the distributive property to multiply 4a^{3}-2a^{2}+a by a.
\left(4a^{3}-2a^{2}+a\right)a
Divide each term of 28a^{3}-14a^{2}+7a by 7 to get 4a^{3}-2a^{2}+a.
4a^{4}-2a^{3}+a^{2}
Use the distributive property to multiply 4a^{3}-2a^{2}+a by a.
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