Do you need to know what two numbers multiply to -15 and add to -21? In other words, do you need to find the two numbers whose product is -15 and sum is -21? No problem! The two numbers that multiply to -15 and add to -21 are as follows:
-21.69151
0.69151
Here is the math to prove that our above answer to "What two numbers multiply to -15 and add to -21?" is correct:
Multiply:
-21.69151 × 0.69151 ≈ -15
Add
-21.69151 + 0.69151 = -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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