Final answer:
The expression (-1)x(-1)x-(1)x.....(2m+1) is equal to 1 when m is a natural number.
Step-by-step explanation:
Natural numbers are a set of positive integers starting from 1 and continuing indefinitely.
The expression (-1)x(-1)x-(1)x.....(2m+1) is equal to 1 when m is a natural number.
When two negative numbers are multiplied, the result is positive. In this case, -1 multiplied by -1 is 1.
Therefore, no matter how many times we continue the pattern, the answer will always be 1.