This PYQ is from

UGC-NET-Paper1

Maths

UGC-NET-Paper1 PYQs

Year-wise PYQs

Section-wise PYQs

Read the Question carefully and choose the correct option.
The difference of the square of two consecutive even numbers is 84. What is the sum of these two consecutive even numbers?

1. 34
2. 38
3. 36
4. 42

दो क्रमिक सम संख्याओं के वर्ग का अंतर 84 है। इन दोनों क्रमिक सम संख्याओं का योग क्या है ?

1. 34
2. 38
3. 36
4. 42
This Question came in
UGC-NET-25-September-2020-Shift-2-Q21
UGC-NET Paper 1 Full Course

To-the-point Video Lectures

Topic-wise PYQs

24x7 Doubt Solving

Detailed Explanation & Answer
Let the two consecutive even numbers be x and x + 2.

The difference of their squares is given by: (x + 2)² - x² = 84

Expanding (x + 2)²: (x + 2)² = x² + 4x + 4

So, the difference of the squares is: (x² + 4x + 4) - x² = 84 = 4x + 4 = 84

Solve for x:
4x + 4 = 84
4x = 84 - 4 4x = 80
x = 20
and x+2 = 20 +2 = 22
The two consecutive even numbers are 20 and 22.

The sum of these numbers is: 20 + 22 = 42
माना कि दो क्रमागत सम संख्याएँ x और x + 2 हैं।

उनके वर्गों का अंतर इस प्रकार दिया गया है: (x + 2)² - x² = 84

(x + 2)² का विस्तार: (x + 2)² = x² + 4x + 4

तो, वर्गों का अंतर है: (x² + 4x + 4) - x² = 84 = 4x + 4 = 84

x के लिए हल करें:
4x + 4 = 84
4x = 84 - 4 4x = 80
एक्स = 20
और x+2 = 20 +2 = 22
दो क्रमागत सम संख्याएँ 20 और 22 हैं।

इन संख्याओं का योग है: 20 + 22 = 42
Hello, world! This is a toast message.