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2\left(4\left(a^{2}\right)^{2}-12a^{2}+9\right)-8
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a^{2}-3\right)^{2}.
2\left(4a^{4}-12a^{2}+9\right)-8
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
8a^{4}-24a^{2}+18-8
Use the distributive property to multiply 2 by 4a^{4}-12a^{2}+9.
8a^{4}-24a^{2}+10
Subtract 8 from 18 to get 10.
2\left(4\left(a^{2}\right)^{2}-12a^{2}+9\right)-8
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a^{2}-3\right)^{2}.
2\left(4a^{4}-12a^{2}+9\right)-8
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
8a^{4}-24a^{2}+18-8
Use the distributive property to multiply 2 by 4a^{4}-12a^{2}+9.
8a^{4}-24a^{2}+10
Subtract 8 from 18 to get 10.