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a^{2}+6a-13
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a^{2}+6a-13
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5a^{2}-2a-1-12+8a-4a^{2}
Use the distributive property to multiply -4 by 3-2a+a^{2}.
5a^{2}-2a-13+8a-4a^{2}
Subtract 12 from -1 to get -13.
5a^{2}+6a-13-4a^{2}
Combine -2a and 8a to get 6a.
a^{2}+6a-13
Combine 5a^{2} and -4a^{2} to get a^{2}.
5a^{2}-2a-1-12+8a-4a^{2}
Use the distributive property to multiply -4 by 3-2a+a^{2}.
5a^{2}-2a-13+8a-4a^{2}
Subtract 12 from -1 to get -13.
5a^{2}+6a-13-4a^{2}
Combine -2a and 8a to get 6a.
a^{2}+6a-13
Combine 5a^{2} and -4a^{2} to get a^{2}.
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