Do you need to know what two numbers multiply to -21 and add to 1? In other words, do you need to find the two numbers whose product is -21 and sum is 1? No problem! The two numbers that multiply to -21 and add to 1 are as follows:
-4.10977
5.10977
Here is the math to prove that our above answer to "What two numbers multiply to -21 and add to 1?" is correct:
Multiply:
-4.10977 × 5.10977 ≈ -21
Add
-4.10977 + 5.10977 = 1
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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