Q. Find the 11th term of the arithmetic sequence −5x+9,−7x+2,−9x−5,…Answer:
Find Common Difference: To find the 11th term of the arithmetic sequence, we first need to determine the common difference (d) of the sequence. We can do this by subtracting the first term from the second term.Calculation: (−7x+2)−(−5x+9)=−7x+2+5x−9=−2x−7
Use Arithmetic Sequence Formula: Now that we have the common difference, we can find the nth term of an arithmetic sequence using the formula:nth term=a1+(n−1)dwhere a1 is the first term and d is the common difference. We will use this formula to find the 11th term.
Substitute Values: Substitute the values into the formula to find the 11th term.a1=−5x+9, d=−2x−7, and n=11.Calculation: 11th term = (−5x+9)+(11−1)(−2x−7)
Simplify Expression: Simplify the expression to find the 11th term.Calculation: 11th term = (−5x+9)+10(−2x−7)=−5x+9−20x−70=−25x−61
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