Explanation: Before we begin, remember the following: (a + b)(a + b) = (a + b)² = a² + 2ab + b²
Now, for the given we have: (x + 5)(x + 5) We can note that the two brackets are identical. Therefore, we can apply the above rule as follows: (x + 5)(x + 5) = (x + 5)² = (x)² + 2(x)(5) + (5)² = x² + 10x + 25
