def derivative(a):
    """
    Compute the derivative of f(a) = a**2 - 10*a + 28 at a.
    """
    # TODO: implement this function
    pass


def find_minimum(start, learning_rate, steps):
    """
    Use gradient descent to approximate the minimum of the quadratic function.
    """
    # TODO: implement this function
    pass


if __name__ == "__main__":
    # Simple example for manual testing
    result = find_minimum(6, 0.1, 3)
    print(result)
