Final answer:
Ancient people solved quadratic equations using geometric and arithmetic methods, including the geometrical approaches of Greek mathematicians and the numerical systems of the Maya and Indians.
Step-by-step explanation:
The conclusion of how ancient people solved quadratic equations is that they used geometric and arithmetic methods. Unlike modern algebraic methods, ancient civilizations such as the Greeks, Maya, and Indians applied their own unique mathematical knowledge to solve complex problems. The Greeks relied on geometric principles, as evidenced by mathematicians like Euclid and Pythagoras, while the ancient Maya civilization used their advanced understanding of numbers and symbols, and Indians contributed significantly with the invention of decimals and zero, which are crucial for solving quadratic equations.