Finding the Modulus of a Complex Number

Consider the complex number $z = 3 + 4i$. What is the modulus of $z$?

Recall that the modulus of a complex number $z = a + bi$ is given by the formula: $$|z| = ext{sqrt}(a^2 + b^2)$$ where $a$ and $b$ are the real and imaginary parts of the complex number, respectively.