2/(a-b) – 5/(b-a)=

A    -10/(2ab-a^2-b^2)

B    -3/(a-5)

C    -7/(a-b)

D    -7/(b-a)

Solution

Correct Answer: Option D

 

2/(a-b) – 5/(b-a)

= {2/ (-1)(b-a)} - 5/(b-a)

=  -2/(a-b) – 5/(b-a)

= -7/(b-a) Alternatively,

the answer could have been, "7/(a-b)", but there were no option "7/(a-b)"

 

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