(3m+4n)-(m-2n)(3m-8n)
(3m+4n)−1(m−2n)(3m−8n)
(3m+4n)-3m²+8mn+2n(3m-8n)
(3m+4n)-3m²+8mn+6mn-16n²
(3m+4n)-3m²+14mn-16n²
3m+4n-3m²+14mn-16n²
-3m²+14mn-16n²+3m+4n
(3m+4n)-(m-2n)(3m-8n)
(3m+4n)−1(m−2n)(3m−8n)
(3m+4n)-3m²+8mn+2n(3m-8n)
(3m+4n)-3m²+8mn+6mn-16n²
(3m+4n)-3m²+14mn-16n²
3m+4n-3m²+14mn-16n²
-3m²+14mn-16n²+3m+4n