To find the answer to "What two numbers have a product of 4 and a sum of 98?" we first state what we know. We are looking for x and y and we know that x • y = 4 and x + y = 98.
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 = 98 and solve it for y to get y = 98 - x. Then, we replace y in x • y = 4 with 98 - x to get this:
x • (98 - x) = 4
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 4 and a sum of 98. The numbers are:
0.04083
97.95917
That's it! The two numbers that have a product of 4 and a sum of 98 are 0.04083 and 97.95917 as proven below:
0.04083 • 97.95917 ≈ 4
0.04083 + 97.95917 = 98
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.