4(7-2a)-(a-4)^2=28-8а-(а^2 -8a+16)=28-8a-a^2 +8a-16= -a^2+12
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4(7-2a)-(a-4)^2=28-8а-(а^2 -8a+16)=28-8a-a^2 +8a-16= -a^2+12