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3 . 1 3 The divide and average method, an old - time method for approximating the square root of any positive number a ,

3.13 The divide and average method, an old-time method
for approximating the square root of any positive number a,
can be formulated as
x = x + a/x
2
Write a well-structured M-file function based on the
while...break loop structure to implement this algo-
rithm. Use proper indentation so that the structure is clear. At
each step estimate the error in your approximation as
\epsi =
x new x old
x new
Repeat the loop until \epsi is less than or equal to a specified
value. Design your program so that it returns both the result
and the error. Make sure that it can evaluate the square root
of numbers that are equal to and less than zero. For the latter
case, display the result as an imaginary number. For exam-
ple, the square root of 4 would return 2i. Test your program
by evaluating a =0,2,10 and 4 for \epsi =1\times 104

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