16Hit1600
Advanced MathHardDifference of two numbers from sum and product

Advanced Math practice question

Two positive numbers have a sum of 13 and a product of 36. What is the positive difference between them?

Answer: 5

The numbers are roots of n² − 13n + 36 = (n − 4)(n − 9) = 0: 4 and 9. Their difference is 5.

Common wrong answers

If you answered 4
4 is the smaller number.
If you answered 9
9 is the larger number.
If you answered 13
13 is the sum.

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