Mathematics, 05.05.2020 15:23 suevazpue

To subtract two rational expressions, when do we need to find a common denominator?
when there are like numerators
A.)when the numerator is zero
B.)when there are unlike numerators
C.)when there are like denominators
D.)when there are unlike denominators

Please help only one shot

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To subtract two rational expressions, when do we need to find a common denominator?
when there...