3n2-8n+4 = (3n-2)(n-2) when factored
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Assuming you meant 7n (not just 7 at the end of your question) - first... simplify the equation. Numbers raised to powers get priority - so your new sum is... 5n - 64n + 25n + n + 7n.... This simplifies to... -26n
3n+1=7 3*2+1=7
3(3n - 1)(n + 1)
3n + 2n = 25 5n = 25 n = 5
3n = 15 + 12 = 27, 27/3 = 9 = n