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The difference of squares of two numbers is 180. The square of the smaller number is 8 times the larger number. Find two numbers.

Correct Answer: -12 & 18

Explanation:

Given, difference of the squares of two numbers is 180.


k2 - l2 - 180


 


Also, square of the smaller number is 8 times the larger.


= l= 8k


 


Thus, k2 - 8a - 180 = 0


k2 – 18k + 10k - 180 = 0


→  k(k - 18) + 10(k – 18) = 0


= (k + 10)(k – 18) = 0


→  k = -10, 18


 


Thus, the other number is


324 - 180 = l2 


 


→ Numbers are 12, 18 or -12, 18.


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