Factorise a(a-4)(a²-4a-1)-20
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Step-by-step explanation:
(a2 - 4a)(a2-4a-1)-20 =0
a2-4a-1-20=0
a2-(7-3)a-21=0
a2-7a+3a-21=0
a(a-7)+3(a-7)=0
(a+3)(a-7)=0
a-7=0
a=7
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