Develop an efficient algorithm to find the square root of a positive real number.
Take as a 1st value x=N/2
iterate by making a new x= average of old x and N divided by old x
example : N=100
X= 50
X=1/2(50+2)=26
X=1/2(26+100/26)=14.9
X=1/2(14.9+100/14.9)=10.8
X=1/2(10.8+100/10.8)=10.03 ETC
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