Question

If x = √7+√5 and y= √7-√5 then evaluate x 2+y2

Answer 1

Answer:

Given, x=5

Lets evaluate y=x+7=5+7=12

Now for given expression, its value at given x=5 and y=12 is 

Therefore, x2+y2 =52+122

=25+144

=169

=13