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...
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4n - 7n = 21(4-7) n =21-3n = 21divide both sides by -3n = -7
To find the answer to the expression 7n - 2 - 3n + 4, you first simplify by combining like terms. Combine the 7n and -3n terms to get 4n. Then, combine the -2 and +4 terms to get +2. Therefore, the final answer is 4n + 2.
n=6
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 - 9 + 4n = 8nCombine like terms:7n - 9 = 8nSubtract 7n from both sides:-9 = n