Regula Falsi

function x = regulaFalsi(a, b, n)

    c = f(a);
    d = f(b);

    if c * d > 0
        error('The function has same sign on both the sides')
    end

    for i = 1 : n

        if f(a) == f(b)
            break;
        end

        x = (a * f(b) - b * f(a)) / (f(b) - f(a));

        if f(x) < 0
            a = x;
        elseif f(x) > 0
            b = x;
        end

    end
end