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a^{2}\left(16a^{2}-24a+9\right)-a\left(4a-3\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4a-3\right)^{2}.
16a^{4}-24a^{3}+9a^{2}-a\left(4a-3\right)
Use the distributive property to multiply a^{2} by 16a^{2}-24a+9.
16a^{4}-24a^{3}+9a^{2}-\left(4a^{2}-3a\right)
Use the distributive property to multiply a by 4a-3.
16a^{4}-24a^{3}+9a^{2}-4a^{2}+3a
To find the opposite of 4a^{2}-3a, find the opposite of each term.
16a^{4}-24a^{3}+5a^{2}+3a
Combine 9a^{2} and -4a^{2} to get 5a^{2}.
a^{2}\left(16a^{2}-24a+9\right)-a\left(4a-3\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4a-3\right)^{2}.
16a^{4}-24a^{3}+9a^{2}-a\left(4a-3\right)
Use the distributive property to multiply a^{2} by 16a^{2}-24a+9.
16a^{4}-24a^{3}+9a^{2}-\left(4a^{2}-3a\right)
Use the distributive property to multiply a by 4a-3.
16a^{4}-24a^{3}+9a^{2}-4a^{2}+3a
To find the opposite of 4a^{2}-3a, find the opposite of each term.
16a^{4}-24a^{3}+5a^{2}+3a
Combine 9a^{2} and -4a^{2} to get 5a^{2}.