Q. Find the 56 th term of the arithmetic sequence −14,−26,−38,…Answer:
Identify First Term: To find the 56th term of an arithmetic sequence, we need to use the formula for the nth term of an arithmetic sequence, which is an=a1+(n−1)d, where an is the nth term, a1 is the first term, n is the term number, and d is the common difference between the terms.
Find Common Difference: First, we identify the first term a1 of the sequence, which is −14.
Calculate 56th Term: Next, we need to find the common difference (d). We can do this by subtracting the first term from the second term: −26−(−14)=−26+14=−12.
Substitute Values: Now that we have the first term and the common difference, we can find the 56th term (a56) using the formula: a56=a1+(56−1)d.
Perform Calculation: Substitute the known values into the formula: a56=−14+(56−1)(−12).
Multiply and Add: Perform the calculation inside the parentheses first: 56−1=55.
Multiply and Add: Perform the calculation inside the parentheses first: 56−1=55.Now multiply 55 by the common difference, −12: 55×−12=−660.
Multiply and Add: Perform the calculation inside the parentheses first: 56−1=55.Now multiply 55 by the common difference, −12: 55×−12=−660.Finally, add the first term to this product to find the 56th term: a56=−14+(−660)=−674.
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