To find the answer to "What two numbers have a product of -128 and a sum of -131?" we first state what we know. We are looking for x and y and we know that x • y = -128 and x + y = -131.
Before we keep going, it is important to know that x • y is the same as y • x and x + y is the same as y + x. The two variables are interchangeable. Which means that when we create one equation to solve the problem, we will have two answers.
To solve the problem, we take x + y = -131 and solve it for y to get y = -131 - x. Then, we replace y in x • y = -128 with -131 - x to get this:
x • (-131 - x) = -128
Like we said above, the x and y are interchangeable, therefore the x in the equation above could also be y. The bottom line is that when we solved the equation we got two answers which are the two numbers that have a product of -128 and a sum of -131. The numbers are:
-131.96992
0.96992
That's it! The two numbers that have a product of -128 and a sum of -131 are -131.96992 and 0.96992 as proven below:
-131.96992 • 0.96992 ≈ -128
-131.96992 + 0.96992 = -131
Note: Answers are rounded up to the nearest five decimals if necessary so the answers may not be exact.
Product Sum Calculator
Need the answer to a similar problem? Submit another product and sum below to find the two numbers that make your product and sum.