Question

inventor of formula method​

Answer 1

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His solution gives only one root, even when both roots are positive. The Indian mathematician Brahmagupta (597–668 AD) explicitly described the quadratic formula in his treatise Brāhmasphuṭasiddhānta published in 628 AD, but written in words instead of symbols.

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Answer 2

answer is shridhar

it is also known as shridar's formula method..

hopes it helps u