Q8 of 81 Page 161

If and xy = 1, let us show that

Formula used.


(a – b)2 = a2 – 2ab + b2


x =


xy = 1


y =


y = =


x + y = +


=


=


= = 5


x-y = –


=


=


= = √21



Add and Subtract xy both on numerator and denominator


=


Putting values we get;


=


Hence proved.


More from this chapter

All 81 →
7

If let us calculate the simplified value of

 7

If let us calculate the simplified value of

 9

Let us write which one is greater of and

10

If the value of is