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Evaluate:

sum_(n=1)^(4)(nx-1)
Answer:

Evaluate:\newlinen=14(nx1) \sum_{n=1}^{4}(n x-1) \newlineAnswer:

Full solution

Q. Evaluate:\newlinen=14(nx1) \sum_{n=1}^{4}(n x-1) \newlineAnswer:
  1. Write Terms Explicitly: Write out the terms of the series explicitly.\newlineThe series is n=14(nx1)\sum_{n=1}^{4}(nx-1), which means we add up the terms (nx1)(nx-1) for each value of nn from 11 to 44.\newlineSo the terms are:\newline(1x1)+(2x1)+(3x1)+(4x1)(1x-1) + (2x-1) + (3x-1) + (4x-1)
  2. Combine Like Terms: Combine like terms.\newlineWe can combine the xx terms and the constant terms separately.\newline(1x+2x+3x+4x)(1+1+1+1)(1x + 2x + 3x + 4x) - (1 + 1 + 1 + 1)\newlineThis simplifies to:\newline10x410x - 4
  3. Check for Errors: Check for any mathematical errors.\newlineThere are no mathematical errors in the previous steps. The terms were combined correctly, and the like terms were added together properly.
  4. Write Final Answer: Write the final answer.\newlineThe sum of the series from n=1n=1 to 44 of the expression (nx1)(nx-1) is 10x410x - 4.

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