Simplify the rational expression.
- 9x / x - x²
a. - 9 / x - 1
b. x / x - x²
c. 9 / x + 1
d. 9 / x - 1
we have - 9x / x - x²
so : - 9x / x(1 - x) = -9/(1 - x) = -9/ -(x - 1) = 9/(x - 1)
so the solution is d. 9/x - 1
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