To find the answer to "What two numbers have a product of 3 and a sum of -13?" we first state what we know. We are looking for x and y and we know that x • y = 3 and x + y = -13.
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 = -13 and solve it for y to get y = -13 - x. Then, we replace y in x • y = 3 with -13 - x to get this:
x • (-13 - x) = 3
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 3 and a sum of -13. The numbers are:
-12.76498
-0.23502
That's it! The two numbers that have a product of 3 and a sum of -13 are -12.76498 and -0.23502 as proven below:
-12.76498 • -0.23502 ≈ 3
-12.76498 + -0.23502 = -13
Note: Answers are rounded up to the nearest five decimals if necessary so the answers may not be exact.
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