Q. If a1=4 and an+1=(an)2−5 then find the value of a4.Answer:
Given terms: We are given the first term of the sequence, a1=4, and the recursive formula for the sequence, an+1=(an)2−5. To find a4, we need to find a2, a3, and then a4 using the recursive formula.
Find a2: First, let's find a2 using the recursive formula and the given first term a1=4.a2=(a1)2−5=42−5=16−5=11.
Find a3: Next, we find a3 using the value of a2 we just found.a3=(a2)2−5=112−5=121−5=116.
Find a4: Finally, we find a4 using the value of a3. $a_{\(4\)} = (a_{\(3\)})^\(2\) - \(5\) = \(116\)^\(2\) - \(5\) = \(13456\) - \(5\) = \(13451\).