medium · SAT Math
Which of the following is equivalent to the rational expression (x^2 - 16)/(x^2 - 5x + 4) for all values of x where the expression is defined?
- (x-4)/(x-4)
- (x-4)/(x-1)
- (x+4)/(x-1)
- (x+4)/(x-4)
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