There is an expression (a-x)(b-x)(c-x)...(z-x), where the sequence continues through the entire English alphabet. What is this expression equal to?

The expression ((a - x)(b - x)(c - x) \ldots (z - x)) contains the factor ((x - x)), since the letter "x" is in the sequence of the English alphabet. Therefore, one of the factors will be ((x - x) = 0), which means the entire product is 0.