He was not the first to look at approximate solutions to this equation since al-Biruni had worked on it earlier. However, the iterative method proposed by al-Kashi was:
Siya ay hindi ang unang upang tumingin sa wastong solusyon sa equation na ito dahil al-Biruni ay nagtrabaho sa mga ito ng mas maaga. Gayunman, ang paraan ng umuulit iminungkahi ng al-Kashi ay: