► Ömer Hayyam made important contributions to both sides of mathematics . He has done important work on both geometry and algebra . Hayyam created solutions for cubic equations by using the intersection of conic sections with circles . Hayyam published her studies on algebra as a textbook . Here he produced solutions to high-grade equations . Today , Hayyam put forward the concept that we call “ unknown ” in the equations and express with x . It is said that Ömer Hayyam found the Pascal triangle