We know that, 2m,
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
m2 + 1,
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
m2 - 1 make Pythagorean triplets.
Put, 2m=14⇒m=7.
m2 - 1 = 72 - 1 = 49−1=48
m2 + 1 = 72 + 1 = 49+1=50.
Hence (14,48,50) is a Pythagorean triplet.