Hi,
In order to rationalise the fraction I must multiply the numerator and denominator by . I do not understand why this is so. Why does the sign only change for the surd and not the rational number (1) which is added to it?
Thanks for any help
Hi,
In order to rationalise the fraction I must multiply the numerator and denominator by . I do not understand why this is so. Why does the sign only change for the surd and not the rational number (1) which is added to it?
Thanks for any help