sympy: Sympy is a system for symbolic maths in python. It doesn't just compute, it also differentiates, integrates and automates common calculus steps. It also has a great documentation page.
Let's first install it.
pip install sympy
The code from this video is listed below.
import sympy as sp
x = sp.symbols('x')
f = x ** 2 + 4 * x - 16
sp.solve(f, x)