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4-2a^{2}
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4-2a^{2}
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-8+6a^{2}-4\left(2a^{2}-3\right)
Use the distributive property to multiply -2 by 4-3a^{2}.
-8+6a^{2}-8a^{2}+12
Use the distributive property to multiply -4 by 2a^{2}-3.
-8-2a^{2}+12
Combine 6a^{2} and -8a^{2} to get -2a^{2}.
4-2a^{2}
Add -8 and 12 to get 4.
-8+6a^{2}-4\left(2a^{2}-3\right)
Use the distributive property to multiply -2 by 4-3a^{2}.
-8+6a^{2}-8a^{2}+12
Use the distributive property to multiply -4 by 2a^{2}-3.
-8-2a^{2}+12
Combine 6a^{2} and -8a^{2} to get -2a^{2}.
4-2a^{2}
Add -8 and 12 to get 4.
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