Which of the following expression(s) is valid for all real values of x?

greuser123 · July 10, 2021, 8:03pm

2^x
x^3/2
x^2/3
1/(1+x^2)
1/(1+x^3)
I’m not sure how to solve this problem.

Leaderboard · July 10, 2021, 8:16pm

See the “GRE Easy Quant Practice - Build Your Foundation - June 28, 2021” video at Quant Practice - GregMat. Around the 48:30 mark.

annie.nh.truong · July 20, 2021, 12:15am

Hey guys, I am having difficulties with this problem. Can someone solve this please? MUCH APPRECIATED!

Leaderboard · July 20, 2021, 6:54am

Have you seen the above link that I posted?