(1+_)**2

Question

The answer is 16, any one explain, pls..

Answer 1

(1+3)**2
4**2
4*4
16

Answer 2

(1+3)**2 == 16

// Exponentiation
//https://www.w3schools.com/JUMP_LINK__&&__python__&&__JUMP_LINK/python_operators.asp

Answer 3

Explain mathematically pls

Answer 4

Thanks bro..