Fill in the blank with a constant, so that the resulting expression can be factored as the product of two linear expressions:
2mn - 18m + 7n - 3mn + 15m + 8n + ___
The correct constant is -47.
2mn - 18m + 7n - 3mn + 15m + 8n + _____ simplify
-mn - 3m + 15n + ____
Take the product of the absolute value of the coefficients on m, n = 3 * 15 = 45
This is the added constant
The factrorization is
(-m + 15) (n + 3) = -mn -3m + 15n + 45
+452 
