(а^2+4a)^2-a^2(a^2-4)-4a^2(2a-1)= a^4+8a^3+16a^2-a^4+4a^2-8a^3+4a^2=24a^2
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(а^2+4a)^2-a^2(a^2-4)-4a^2(2a-1)= a^4+8a^3+16a^2-a^4+4a^2-8a^3+4a^2=24a^2