Difference of Squares

Challenge Overview

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.

Visit the difference-of-squares exercise on Exercism to read the full instructions and download the exercise files.

Community Solutions

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The following are the top 3 community solutions by stars:

Solution 1 by @anurat (⭐ 1) — View on Exercism
Solution 2 by @BomDia16 (⭐ 0) — View on Exercism
Solution 3 by @shadowlion (⭐ 0) — View on Exercism

Source: Exercism php/difference-of-squares

💡 View Solution

function squareOfSum(int $n): int {
	return ($n*($n +1)/2)**2;
}

function sumOfSquares(int $n): int {
	return $n*($n +1)*(2*$n +1)/6;
}

function difference(int $n): int {
	return squareOfSum($n) -sumOfSquares($n);