To find the answer to "What two numbers have a product of -18 and a sum of -36?" we first state what we know. We are looking for x and y and we know that x • y = -18 and x + y = -36.
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 = -36 and solve it for y to get y = -36 - x. Then, we replace y in x • y = -18 with -36 - x to get this:
x • (-36 - x) = -18
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 -18 and a sum of -36. The numbers are:
-36.49324
0.49324
That's it! The two numbers that have a product of -18 and a sum of -36 are -36.49324 and 0.49324 as proven below:
-36.49324 • 0.49324 ≈ -18
-36.49324 + 0.49324 = -36
Note: Answers are rounded up to the nearest five decimals if necessary so the answers may not be exact.
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