1 times 79 is 79, but what is the answer if both 1 and 79 are negative numbers? Here we will determine if the answer to negative 1 times negative 79 is positive 79 or negative 79.
There are many different ways to explain and determine if the answer to negative 1 times negative 79 is -79 or +79 using mathematical terms such as additive inverse and mathematical laws like the Distribute Law.
We will take a different approach - process of elimination: We will simply test if -79 is the correct answer using basic algebra.
We will test if -79 is correct by setting up the equation negative 1 times negative 79 equals negative 79, and then simplifying the equation to see if it is true.
(-1) (-79) = (-79)
Divide both sides of the equation by (-79) :
|
| = |
|
The numerator and denominator on the left side both have (-79) which even each other out and can be removed:
| (-1) = |
|
The numerator and denominator on the right side both have a minus sign (-) which even each other out and can be removed:
| (-1) = |
|
A numerator of 79 and denominator of 79 on the right side is the same as 79 divided by 79 which is 1. Now we end up with this untrue equation:
(-1) = (1)
-1 is NOT equal to 1, thus we have proven that negative 1 times negative 79 is not equal to -79. The answer must therefore be 79:
-1 x -79 = 79
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 1 times negative 79 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 1 times negative 80?
Here is the next problem on our list that we have explained and calculated.
Copyright | Privacy Policy | Disclaimer | Contact