Question 125926
{{{(a^2-2a) /(4-2a)}}}
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Factor out a in the numerator and 2 in the denominator
{{{(a(a - 2))/(2(2 - a))}}}
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In the denominator, change the sign outside the brackets to change the signs inside the brackets
{{{(a(a - 2))/(-2(-2 + a))}}} = {{{(a(a - 2))/(-2(a - 2))}}}; 
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Now we can cancel out the (a-2)'s
{{{a/(-2)}}} = {{{-a/2}}}: note that it is negative
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