An iterative formula is shown below.

[tex] x_{n+1}=8+\frac{500}{x_n^2} [/tex]

Starting with [tex] x_1=59 [/tex], work out the value of [tex] x_3 [/tex]. Give your answer to 2 decimal places.



Answer :

To solve for [tex]\( x_3 \)[/tex] using the iterative formula [tex]\( x_{n+1} = 8 + \frac{500}{x_n^2} \)[/tex] and the initial value [tex]\( x_1 = 59 \)[/tex], we proceed as follows:

1. Start with the initial value:
[tex]\[ x_1 = 59 \][/tex]

2. Calculate [tex]\( x_2 \)[/tex] using the iterative formula:
[tex]\[ x_2 = 8 + \frac{500}{x_1^2} \][/tex]
Substitute [tex]\( x_1 = 59 \)[/tex]:
[tex]\[ x_2 = 8 + \frac{500}{59^2} \][/tex]
Evaluating [tex]\( 59^2 \)[/tex]:
[tex]\[ 59^2 = 3481 \][/tex]
Then, calculate [tex]\(\frac{500}{3481}\)[/tex]:
[tex]\[ \frac{500}{3481} \approx 0.143636885952313 \][/tex]
Now, add this value to 8:
[tex]\[ x_2 = 8 + 0.143636885952313 \approx 8.143636885952313 \][/tex]

3. Calculate [tex]\( x_3 \)[/tex] using the iterative formula:
[tex]\[ x_3 = 8 + \frac{500}{x_2^2} \][/tex]
Substitute [tex]\( x_2 \approx 8.143636885952313 \)[/tex]:
[tex]\[ x_3 = 8 + \frac{500}{(8.143636885952313)^2} \][/tex]
Evaluating [tex]\((8.143636885952313)^2 \)[/tex]:
[tex]\[ (8.143636885952313)^2 \approx 66.32271810800071 \][/tex]
Then, calculate [tex]\(\frac{500}{66.32271810800071}\)[/tex]:
[tex]\[ \frac{500}{66.32271810800071} \approx 7.539337807203339 \][/tex]
Now, add this value to 8:
[tex]\[ x_3 = 8 + 7.539337807203339 \approx 15.539337807203339 \][/tex]

4. Finally, round [tex]\( x_3 \)[/tex] to 2 decimal places:
[tex]\[ x_3 \approx 15.54 \][/tex]

Therefore, the value of [tex]\( x_3 \)[/tex] is [tex]\( 15.54 \)[/tex] when rounded to 2 decimal places.