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Question 70

From the sum of x2y21,y2x21 and 1x2y2, subtract (1+y2).


Solution

Sum of x2y21,y2x21 and 1x2y2
=x2y21+y2x21+1x2y2
On combining the like terms.
=x2x2x2y2+y2y211+1=x2y21
Now, subtract (1+y2) from x2y21
=x2y21[(1+y2)]=x2y21+1+y2=x2y2+y21+1=x2

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