Q. a(n)=−6−4(n−1)Find the 4th term in the sequence.
Understand the formula: Understand the sequence formula.The given sequence is defined by the formula a(n)=−6−4(n−1). This is an arithmetic sequence where each term is generated by starting with −6 and subtracting 4 times the quantity (n−1), where n is the position of the term in the sequence.
Substitute n with 4: Substitute n with 4 to find the 4th term.To find the 4th term, a(4), we substitute n with 4 in the formula: a(4)=−6−4(4−1).
Perform calculation inside parentheses: Perform the calculation inside the parentheses.Calculate the value inside the parentheses: 4−1=3.So, a(4)=−6−4(3).
Multiply 4 by 3: Multiply 4 by 3.Now, multiply 4 by 3 to get 12: 4×3=12.So, a(4)=−6−12.
Subtract 12 from −6: Subtract 12 from −6. Finally, subtract 12 from −6 to find the 4th term: a(4)=−6−12=−18.