Explanation about product of two negative numbers being positive.
17515
Why is negative times negative = positive?
139158
Inequality concerning nonnegative numbers (related to Hanner's inequalities)
54030
Square and square root and negative numbers
76914
Integer division by negative number
155426
Difference between negative and positive temperatures written as absolute value or the negative integer?
100720
Negative quotients and their remainders
112644
The product of two numbers that can be written as the sum of two squares
64262
cubic root of negative numbers
44763
Modulo operator with negative values
116780
product is twice a square
33601
Emphasis of this double negative?
20713
The sum of an uncountable number of positive numbers
34036
Positive correlation and negative regressor coefficient sign
56311
Proving $(1+a_{2})^{2}(1+a_{3})^{3}\cdots(1+a_{n})^{n}\ge n^n$ for positive reals $a_2,\ldots, a_n$ whose product is $1$
24551
How to prove that the sum and product of two algebraic numbers is algebraic?
99257
Dot Product Intuition
28737
Negative binomial coefficient