To find the answer to "What two numbers have a product of 130 and a sum of -121?" we first state what we know. We are looking for x and y and we know that x • y = 130 and x + y = -121.
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 = -121 and solve it for y to get y = -121 - x. Then, we replace y in x • y = 130 with -121 - x to get this:
x • (-121 - x) = 130
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 130 and a sum of -121. The numbers are:
-119.91591
-1.08409
That's it! The two numbers that have a product of 130 and a sum of -121 are -119.91591 and -1.08409 as proven below:
-119.91591 • -1.08409 ≈ 130
-119.91591 + -1.08409 = -121
Note: Answers are rounded up to the nearest five decimals if necessary so the answers may not be exact.
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