Solved: The mathematician Girolamo Cardano is credited

Chapter 2, Problem 2.2.64

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The mathematician Girolamo Cardano is credited with the first use (in 1545) of negative square roots in solving the now-famous problem, Find two numbers whose sum is 10 and whose product is 40. Show that the complex numbers and satisfy the conditions of the problem. (Cardano did not use the symbolism or even He wrote R.m 15 for meaning radix minus 15. He regarded the numbers 15 and as fictitious or ghost numbers, and considered the problem manifestly impossible. But in a mathematically adventurous spirit, he exclaimed, Nevertheless, we will operate. )

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