سوال ۱۸ کنکور ارشد ریاضی ۱۴۰۵

PASSAGE 2 (paragraph 2): "Khayyam's work made an important contribution to the development of algebra. Although he used geometric methods for the solution of cubic equations, he was keenly aware of the limitations of this method. Regretting the lack of a purely algebraic method of solving cubic equations, he admitted, 'Neither we, nor any of those who are concerned with algebra have been able to prove this equation—perhaps others who follow us will be able to fill the gap.' Others did follow, but not until 470 years later, when Cardano published a purely algebraic solution of cubic equations..."

According to paragraph 2, regarding the defects of Khayyam's method, ……………….. .