SOLUTION: Factor this expression completely. Note: Place factors alphabetically in the grid! mn - 4m - 5n + 20

Algebra ->  Algebra  -> Polynomials-and-rational-expressions -> SOLUTION: Factor this expression completely. Note: Place factors alphabetically in the grid! mn - 4m - 5n + 20       Log On

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Question 612894: Factor this expression completely. Note: Place factors alphabetically in the grid!
mn - 4m - 5n + 20

Answer by jim_thompson5910(28715) About Me  (Show Source):
You can put this solution on YOUR website!
mn - 4m - 5n + 20

(mn - 4m) + (-5n + 20)

m(n - 4) + (-5n + 20)

m(n - 4) - 5(n - 4)

(m - 5)(n - 4)

So mn - 4m - 5n + 20 completely factors to (m - 5)(n - 4)