84 times 47 is 3948, but what is the answer if both 84 and 47 are negative numbers? Here we will determine if the answer to negative 84 times negative 47 is positive 3948 or negative 3948.
There are many different ways to explain and determine if the answer to negative 84 times negative 47 is -3948 or +3948 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 -3948 is the correct answer using basic algebra.
We will test if -3948 is correct by setting up the equation negative 84 times negative 47 equals negative 3948, and then simplifying the equation to see if it is true.
(-84) (-47) = (-3948)
Divide both sides of the equation by (-47) :
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| = |
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The numerator and denominator on the left side both have (-47) which even each other out and can be removed:
| (-84) = |
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The numerator and denominator on the right side both have a minus sign (-) which even each other out and can be removed:
| (-84) = |
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A numerator of 3948 and denominator of 47 on the right side is the same as 3948 divided by 47 which is 84. Now we end up with this untrue equation:
(-84) = (84)
-84 is NOT equal to 84, thus we have proven that negative 84 times negative 47 is not equal to -3948. The answer must therefore be 3948:
-84 x -47 = 3948
The above applies to all math problems where you multiply two negative numbers. Multiplying two negative numbers such as negative 84 times negative 47 will always have a positive answer.
Negative Times Negative Calculator
Here you can multiply another two negative numbers together.
What is negative 84 times negative 48?
Here is the next problem on our list that we have explained and calculated.
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