Finding the Modulus of a Complex Number

Consider the complex number $z = 3 + 4i$. To find the modulus of this complex number, use the formula for the modulus, which states:

$$ |z| = ext{sqrt}(a^2 + b^2) $$

where $z = a + bi$, and $a$ and $b$ are real numbers. What is the modulus of the complex number $z$?