Question 920738
The LCD is {{{10a}}}. The goal is to get the denominators equal to the LCD. Then we can combine the fractions.


{{{3/10-8/a}}}


{{{(3a)/(10a)-8/a}}}


{{{(3a)/(10a)-(10*8)/(10*a)}}}


{{{(3a)/(10a)-(80)/(10a)}}}


{{{(3a-80)/(10a)}}}


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The expression {{{3/10-8/a}}} simplifies to {{{(3a-80)/(10a)}}}

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Jim