JavaScript How to calculate the square root without using library and built-in methods in Javascript? calculate square root by hand,calculate square root in excel,

Please help me to write a function to compute the square root of positive real numbers using the formula:

``````x i+1 = (1/2) * (xi + (A / x1)),
``````

where 'A' - input real number.

On the zero iteration next statements have been taken x0 = A The error should be at least 10-6

Output

``````sqrt (2) = 1.414
sqrt (9) = 3
sqrt (25) = 5
``````

You could take xi (`x`) and the new value of xi + 1 (`x1`) and check if the values are equal. Then end the series and return that value.

For starting, you need an apporopriate value like the half of the given value.

``````function sqrt(a) {
var x,
x1 = a / 2;

do {
x = x1;
x1 = (x + (a / x)) / 2;
} while (x !== x1);
return x;
}

console.log(sqrt (2)); // 1.414
console.log(sqrt (9)); // 3
console.log(sqrt (25)); // 5``````

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