Does the Nikon wide 5x zoom has good audio when recording?

I want to start a youtube channel and I was wondering if the audio is good when he camera records.

NO. No camera is going to provide you with good sound.

You need to use a technique called "dual sound recording"

What you do is buy a good digital sound recorder like the Zoom H1 ($100) or H4n ($200) and use it to record the pristine sound.

Then in post when you are editing your video, sync the pristine sound with the crummy sound recorded by ANY camera (except of course an actual video camera that costs in excess of $10,000).

That is the best way to assure good sound on your video.

In actuality, buying a camcorder is always going to be the best choice when making videos

Do not forget to budget for a good sturdy tripod, fluid head and at least two continuous lights (500 Watts or better) to light your set.

If the mic is in the right place to correctly record the audio, yes. Usually, when the mic is in the right place to get good audio, the lens is not set up to get decent video. That does not mean the video or audio are "bad", just can't be used properly.

Since it seems like you are asking about a Nikon point and shoot, we can tell you there's no connector for an external connector - but we can't be 100% sure since we don't know which model you're talking about.

If you already have the Nikon wide 5x zoom, then fhotoace is right.

If you have not yet purchased the camera and video is that important, then get a camcorder with a mic jack. That way you won't need to deal with the external audio recorder and synching audio during editing. The lease expensive camcorder I know if with a mic jack is the Canon HF R600. Fhotoace's suggestions about a tripod and some sort of lighting is sound advice.

I don't know what model "5X zoom" Nikon that is. A built in microphone is generally not expected to be great. The Nikon AW130 is not bad as these things go. It is susceptible to camera handling noise. The new grip on the AW130 helps reduce that. The silicone jacket can help too, except that when water gets in between the jacket and the body that creates its own noises. Being on a tripod should eliminate that. Generally built-in microphones can be susceptible to wind noise despite the wind-noise filter setting. The Nikon AW100 series seems to do better than most. On the other hand, it can be susceptible to audio-dropouts from loud or sharp sounds.
This was taken with an AW130, silicone jacket on.

This was taken with an AW130, silicone jacket off.

What may seem like a background hiss is probably the real ambient sound of water flowing in the water slides.