Q. If a1=4 and an=(an−1)2−2 then find the value of a4.Answer:
Given terms and formula: We are given the first term of the sequence, a1=4, and the recursive formula for the sequence, an=(an−1)2−2. We need to find the value of the fourth term, a4.
Find second term: First, let's find the second term, a2, using the recursive formula with n=2.a2=(a1)2−2Substitute a1=4 into the formula.a2=(4)2−2
Calculate a2: Calculate the value of a2.a2=16−2a2=14Now we have the value of the second term.
Find third term: Next, let's find the third term, a3, using the recursive formula with n=3.a3=(a2)2−2Substitute a2=14 into the formula.a3=(14)2−2
Calculate a3: Calculate the value of a3.a3=196−2a3=194Now we have the value of the third term.
Find fourth term: Finally, let's find the fourth term, a4, using the recursive formula with n=4.a4=(a3)2−2Substitute a3=194 into the formula.a4=(194)2−2
Calculate a4: Calculate the value of a4.a4=37636−2a4=37634Now we have the value of the fourth term.
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