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-a^{4}+3ab+2^{2}\left(a^{2}\right)^{2}
Expand \left(2a^{2}\right)^{2}.
-a^{4}+3ab+2^{2}a^{4}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
-a^{4}+3ab+4a^{4}
Calculate 2 to the power of 2 and get 4.
3a^{4}+3ab
Combine -a^{4} and 4a^{4} to get 3a^{4}.
-a^{4}+3ab+2^{2}\left(a^{2}\right)^{2}
Expand \left(2a^{2}\right)^{2}.
-a^{4}+3ab+2^{2}a^{4}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
-a^{4}+3ab+4a^{4}
Calculate 2 to the power of 2 and get 4.
3a^{4}+3ab
Combine -a^{4} and 4a^{4} to get 3a^{4}.