
According to given figure, The Triangle BDC is a right angled Triangle (Angle D = 90°)
So, we can apply Pythagoras theorem to find the Side a (Hypotenuse)
Now, let's solve ~
Therefore, Length of side a is 5 units ~
(4 to the 4 power) to the x power = 4 to the 32 power
(4^4)^x = 4^32
4^4x = 4^32
4x = 32
x = 8
Answer
x = 8