How can you determine whether a function is onto (surjective)?

[dab]

Thank you sir for your video and keeping it short. I needed to do a last minute review for a test and this was very helpful. Please keep doing more videos

[TanishqTulsi]

Thank you sir for this wonderful explanation

[diegosilberman]

well, imagine being me, i dont speak english hahaha. btw i unsertand the video

[nawarajluitel]

Cant you talk about louder .. try to use higher pitch speaker for recording vedios

[mostafaelgayar]

This video doesn't answer the question in the title, you just explained what a surjective function is and how it looks like on a graph. But you didn't show how to determine whether a function is surjective (assuming that we don't know), which is literally the title of the video, but whatever.

[RajeshKumar-bwjh]

Sir plzzz speak louder very difficult to hear you 😭😭😭😭😭🙏🙏🙏

[sanamalhotra]

Sir, pardon me but do you have a slurry tongue?