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function retur = kvadratrot(tall)
    x = 1;
    er_over_feilgrense = true;
    i = 1;
    while er_over_feilgrense
       ny_x = x + (tall - x^2)/(2*x);
       fprintf('Iterasjon #%d: x_%d = %.10f, x_%d = %.10f\n', i, i-1, x, i, ny_x);
       relativ_endring = abs(ny_x - x)/x;
       er_over_feilgrense = relativ_endring >= 1e-9;
       x = ny_x;
       i = i + 1;
    end
    retur = x;
end