No calc please
1 √102 + √98 √102 + √98 √102 + √98
__________ *__________ = ____________ = ___________
√102 - √98 √102 + √98 102 - 98 4
Note that √102 and √98 ≈ 10 .....so.....
≈10 + ≈ 10 ≈ 20
_________ = ____ ≈ 5
4 4