Question 145204
{{{(a+2b)/4-(a-2b)/4}}} Start with the given expression



{{{(a+2b-(a-2b))/4}}} Since the denominators are equal, this means that we can combine the fractions



{{{(a+2b-a+2b)/4}}} Distribute



{{{(4b)/4}}} Combine like terms


{{{b}}} Reduce



So {{{(a+2b)/4-(a-2b)/4=b}}}