It is an odd two digit number
the sum of its digits is 8
the sum of the squares of its digits is 50

⇔ Consider the first digit = a, and the second digit = b

≡ We know that:
⇔
⇔

≡ Solution:
⇒
⇒
⇒
⇒
⇒

⇔ Cause a × b = 7, there are 2 option the value of ab that:
∴ a = 1, b = 7 → 17
∴ a = 7, b = 1 → 71