To find the answer to "What two numbers have a product of -129 and a sum of -148?" we first state what we know. We are looking for x and y and we know that x • y = -129 and x + y = -148.
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 = -148 and solve it for y to get y = -148 - x. Then, we replace y in x • y = -129 with -148 - x to get this:
x • (-148 - x) = -129
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 -129 and a sum of -148. The numbers are:
-148.86655
0.86655
That's it! The two numbers that have a product of -129 and a sum of -148 are -148.86655 and 0.86655 as proven below:
-148.86655 • 0.86655 ≈ -129
-148.86655 + 0.86655 = -148
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.