Hi there. this may be a simple solution however I don't understand how the Mx(t) turns into beta divided by beta minus t raised to the power alpha? thank you
Since \( \left( 1-\frac{t}{\beta} \right)^{-\alpha} = \left( \frac{\beta - t}{\beta} \right) ^{-\alpha} = \left( \frac{\beta}{\beta - t}\right)^{\alpha}\).