Respuesta :

Answer:

(m-7n)(m+4n)

Since a is equal to 1, the equation can be factored by finding factors that multiply to c and adds to b and add each of the factor to m.

find factor that multiplies to -28n^2 and adds to -3n

-7n times 4n is -28n^2 and -7n plus 4n is -3n

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