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Question : Directions: There are two numbers. The difference between these two numbers is 2 and the difference between their squares is 8. What are those numbers?

Option 1: 12, 10

Option 2: 3, 1

Option 3: 7, 5

Option 4: 8, 6


Team Careers360 4th Jan, 2024
Answer (1)
Team Careers360 23rd Jan, 2024

Correct Answer: 3, 1


Solution : Given:
Let the two numbers be a and b.

The difference between these two numbers is 2.
⇒ a – b = 2                            ———— (1)
And the difference between their squares is 8.
⇒ a 2 – b 2 = 8
As we know that a 2 – b 2 = (a – b)(a + b)
Now, put the value of (a 2 – b 2 ) and (a – b) in a 2 – b 2 = (a – b)(a + b).
⇒ a 2 – b 2 = 2(a + b)
⇒ 8 = 2(a + b)
⇒ 4 = a + b                            ———— (2)
Now, add the equations (1) and (2) –
⇒ a – b + a + b = 2 + 4
⇒ 2a = 6
⇒ a = 3
Now, put the value of a in equation (1) –
⇒ a – b = 2
⇒ 3 – b = 2 ⇒ b = 1

So, the value of a is 3 and b is 1. Hence, the second option is correct.

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