Do you need to know what two numbers multiply to -81 and add to 15? In other words, do you need to find the two numbers whose product is -81 and sum is 15? No problem! The two numbers that multiply to -81 and add to 15 are as follows:
-4.21537
19.21537
Here is the math to prove that our above answer to "What two numbers multiply to -81 and add to 15?" is correct:
Multiply:
-4.21537 × 19.21537 ≈ -81
Add
-4.21537 + 19.21537 = 15
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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