Respuesta :
This proves that the sum of 1/2n(n+1) + 1/2(n+1)(n+2) is always a square number.
What is square number?
When a number is multiplied by itself, the result is a square number. As an illustration, 25 is a square number as it is composed of 5 groups of 5, or 5 x 5. A square number, sometimes known as a perfect square, is an integer that is the square of another integer, or the result of multiplying another integer by itself. For instance, 9 is a square number as it equals 32 and is represented by the symbols 3.
Here,
Find the sum:
=1/2n(n+1) + 1/2(n+1)(n+2)
=1/2(n² + n) + 1/2(n² + 3n + 2)
=1/2(n² + n + n² + 3n + 2)
=1/2(2n² + 4n + 2)
=n² + 2n + 1
=(n + 1)²
This demonstrates that 1/2n(n+1) + 1/2(n+1)(n+2) is always a square number when added together.
To know more about square number,
https://brainly.com/question/16939527
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