(n²-n) (n²+5n+6)=120
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Step-by-step explanation:
n4 + 5n3 + 6n2 - n3 - 5n2 - 6n =120
n4 + 4n3 + n2 - 6n =120
n2(n2 + 4n + 1 - 6n ) =120
n2( n2 -2n + 1)= 120
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