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The sum of Two numbers is 9. The

sum of the squares of the numbers is
41. Find the numbers.

1 Answer

4 votes

Answer:

4 and 5

Explanation:

Assuming your 2nd sentence should be: "The sum of the squares of the two numbers is 41"

X + Y = 9 {equation 1}

X² + Y² = 41 {equation 2}

from equation 1: y = 9-x

Substitute that into equation 2

x² + (9-x)² = 41

x² + 81 - 18x + x²= 41

2x² - 18x + 40 = 0

We can factor out a 2

x² - 9x + 20 = 0

(x-5)(x-4) = 0

x = 5 or 4

checking

Your two numbers are 4 and 5

4² + 5²

= 16 + 25

= 41

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