Radhika, x^2 has to be </= 50, so x has to lie between +/- 7 (or else y^2 will become -ve). Similarly 3y^2 has to be </= 50 so y cannot go beyond +/- 4. regards J Reply

how did u find the range in second one , that is +/- 7 and 4 ?

Radhika, x^2 has to be </= 50, so x has to lie between +/- 7 (or else y^2 will become -ve). Similarly 3y^2 has to be </= 50 so y cannot go beyond +/- 4.

regards

J