1 over surd x has no value since surd is not specific.
In any case, you select a set of values for x from within the domain. Calculate the corresponding values of y and then plot each pair (x, y).
Then, after checking that the denominator of the function does not become zero anywhere, you join the points by a smooth line.
If the denominator does become zero, you select values for x close to where it does, calculate y and plot these as best you can. The graph will have a discontinuity where the denominator is zero.
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Expressed as a surd with an integer denominator, this is equal to (6 sqrt(5))/5. Expressed as a decimal number, rounded to two decimal places, this is equal to 2.68.
Expressed as a surd, the square root of 28 is equal to 2 root 7.
Expressed as a surd, the square root of 1/7 is equal to sqrt(7)/7.
Expressed as a surd in its simplest form, 15/sqrt(50) = 3 sqrt(2)/2. Expressed as a decimal, rounded to two decimal places, this is equal to 2.12.
Expressed as a surd, the square root of 490 is equal to 7 root 10. Rounded to two decimal places, this is equal to 22.14.