Question 651602
{{{(4a-2b-1)(-ab)}}}


{{{(-ab)(4a-2b-1)}}}


{{{(-ab)(4a)+(-ab)(-2b)+(-ab)(-1)}}}


{{{-4a^2b+2ab^2+ab}}}


{{{-4a^2b+ab+2ab^2}}}


So {{{(4a-2b-1)(-ab)}}} simplifies to {{{-4a^2b+ab+2ab^2}}}


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