(a²-a)(4a²-4a-5)-6 factorise
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1.Expand4a^4−4a^3−5a^2−4a^3+4a^2+5a−6
2.Collect like terms4a^4+(−4a^3−4a^3)+(−5a^2+4a^2)+5a−6
3.Simplify4a^4−8a^3−a^2+5a−6
2.Collect like terms4a^4+(−4a^3−4a^3)+(−5a^2+4a^2)+5a−6
3.Simplify4a^4−8a^3−a^2+5a−6
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