Bisection

function x = bisection(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

        x = (a + b) / 2;

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