The GCF is 3n.
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3n2-8n+4 = (3n-2)(n-2) when factored
3n2 - 7n = 0 n(3n - 7) = 0 So either n = 0 or 3n-7 = 0 ie, either n = 0 or n = 7/3 = 21/3 = 2.33...
The GCF is 13xy.
9
If you mean +20 then 5(4n-11)-3n+20 simplifies to 17n-35 and so therefore both expressions are equal