Question 689086
Take it one at a time...
{{{5m^2(m^2) + 5m^2(-2m) + 5m^2(-4) + 3m(m^2) + 3m(-2m) + 3m(-4) - 2(m^2) - 2(-2m) - 2(-4)}}}
...
{{{5m^4 - 10m^3 - 20m^2 + 3m^3 - 6m^2 - 12m - 2m^2 + 4m + 8}}}
...
Combine
{{{highlight_green(5m^4-7m^3-28m^2-8m+8)}}}

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