Simplify the following: .
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( x − a ) ( x − b ) ( x − c ) ( x − d ) . . . ( x − y ) ( x − z )
Expanding it a little bit, we get: ( x − a ) ( x − b ) ( x − c ) ( x − d ) . . . ( x − x ) ( x − y ) ( x − z )
We all know that ( x − x ) = 0
Any number multiplied to 0 is 0
Therefore, ( x − a ) ( x − b ) ( x − c ) ( x − d ) . . . ( x − x ) ( x − y ) ( x − z ) ( x − a ) × ( x − b ) × ( x − c ) × ( x − d ) × . . . × 0 × ( x − y ) × ( x − z ) = 0