Calculate NDVI from Landsat image in ArcGIS

Landsat Normalized Difference Vegetation Index (NDVI) is used to quantify vegetation greenness and is useful in understanding vegetation density and assessing changes in plant health. This video takes you through how to Calculate NDVI from Landsat image in ArcGIS

Formula of NDVI:
In Landsat 4 - 7, NDVI = (Band 4 – Band 3) / (Band 4 + Band 3).
In Landsat 8 - 9, NDVI = (Band 5 – Band 4) / (Band 5 + Band 4).

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[daobuithithuy]

Thanks so much!
I would Like to generate an NDVI map for my study region, which is positioned between three Landsat scenes.
Which method suits:
1) compute NDVI for each Landsat scenes and then mosaic or
2) Mosaic Red and NIR band separately and then performed NDVI