x-1 means 1/x, also called the reciprocal of x.
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No, a negative x a negative = a positive. (-5) x (-2) = 10
when -n = x and x is a negative #, n is the absolute value of x
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cosine(x) = -1x = (270 + 360N) degreesorx = (1.5 + 2N) pi radiansN is any integer, positive or negative.
When one of the factors is less than or equal to 1, and the other is positive. Examples: 1 x 9 = 9 0 x 5 = 0 -1 x 10 = -10 If both are negative, it doesn't work: -10 x -10 = +100