Step 1: Identify the complex number z, which is given as z = -3 + 4i.
Step 2: Recall that the value of |z| (the magnitude of z) is calculated using the formula |z| = √(a^2 + b^2), where a is the real part and b is the imaginary part of z.
Step 3: In our case, the real part a is -3 and the imaginary part b is 4.
Step 4: Substitute the values of a and b into the formula: |z| = √((-3)^2 + (4)^2).
Step 5: Calculate (-3)^2, which is 9.
Step 6: Calculate (4)^2, which is 16.
Step 7: Add the results from Step 5 and Step 6: 9 + 16 = 25.
