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I got confused reading spivak's calculus book and couldn't understand why. They said something like
"if you add ab to both sides, you get (-a)(-b)=(ab)"
It's on the 7th page at the bottom. I believe it's the older version of the textbook.
"if you add ab to both sides, you get (-a)(-b)=(ab)"
It's on the 7th page at the bottom. I believe it's the older version of the textbook.