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(-a-1/2b-6)²
=(-a)²+(-1/2b)²+(-6)²+2×-a×-1/2b+2×-a×-6+2×-1/2b×-6
=a+1/4b²+36+ab+12a+6b
=(-a)²+(-1/2b)²+(-6)²+2×-a×-1/2b+2×-a×-6+2×-1/2b×-6
=a+1/4b²+36+ab+12a+6b
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