Do you need to know what two numbers multiply to -1 and add to 90? In other words, do you need to find the two numbers whose product is -1 and sum is 90? No problem! The two numbers that multiply to -1 and add to 90 are as follows:
-0.01111
90.01111
Here is the math to prove that our above answer to "What two numbers multiply to -1 and add to 90?" is correct:
Multiply:
-0.01111 × 90.01111 ≈ -1
Add
-0.01111 + 90.01111 = 90
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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