Question

(-6m2n3-7m) (-6m2n3 +7m)

Answer 1

Explicación:

$(a-b)(a+b)=a^{2}-b^{2}$

Si:

a=-6m2n3

b=7m

Entonces:

$(-6m2n3-7m)(-6m2n3+7m)= (-6m2n3)^{2} - (7m)^{2} \\=(-6m)^{2}.(2n)^{2}. 3^{2} - (7m)^{2} \\=36m^{2}.4n^{2}.9-49m^{2}\\=324m^{2} .4.n^{2} -49m^{2} \\=1296m^{2}n^{2} -49m^{2}\\ =m^{2}(1296n^{2}-49 )$