Al-Khwarizmi wrote on algebra and treated quadratic equations using both algebraic procedures and geometry.
Representation of Al-Khwarizmi
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Al-Khwarizmi was a Persian mathematician, astronomer, and geographer who lived during the 9th century, particularly in Baghdad, which was part of the Islamic Golden Age. He is often referred to as the "father of algebra," a term that stems from the title of his most famous work, "Al-Kitab al-Mukhtasar fi Hisab al-Jabr wal-Muqabala" (The Compendious Book on Calculation by Completion and Balancing).