Quadratic Expressions and Prime Numbers

The video tutorial explores whether the expression n^2 + n + 5 results in a prime number for any whole number value of N. Ali hypothesizes that it always results in a prime number. The teacher demonstrates the process of substituting values for N, showing calculations for N=1, 2, 3, and 4. While the first three values yield prime numbers, N=4 results in 25, which is not prime. This disproves Ali's hypothesis. The tutorial emphasizes the importance of reasoning and evaluation in mathematical problem-solving, explaining how to earn marks by showing calculations and conclusions.

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