(a² -a) (4a² -4a -5) -6

(a^{2} - a) (4 a^{2} - 4 a - 5) - 6 = a^{2} (4 a^{2} - 4 a - 5) - a (4 a^{2} - 4 a - 5) - 6 = 4 a^{4} - 4 a^{3} - 5 a^{2} - 4 a^{3} + 4 a^{2} + 5 a - 6 = 4 a^{4} - 8 a^{3} - a^{2} + 5 a - 6

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(a2 -a) (4a2 -4a -5) -6