Do you need to know what two numbers multiply to 81 and add to -21? In other words, do you need to find the two numbers whose product is 81 and sum is -21? No problem! The two numbers that multiply to 81 and add to -21 are as follows:
-15.90833
-5.09167
Here is the math to prove that our above answer to "What two numbers multiply to 81 and add to -21?" is correct:
Multiply:
-15.90833 × -5.09167 ≈ 81
Add
-15.90833 + -5.09167 = -21
The answers above are rounded if necessary. Therefore, if you double check that the answer above is correct by using a calculator, you may find it to be slightly off.
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