Answer
$m^2+mn-4m-2n^2+4n+km+2k-4k$
Work Step by Step
$(m-n+k)(m+2n-4)$
$m*m+m*2n+m(-4)+(-n)m+(-n)2n+(-n)(-4)+km+k2n+k(-4)$
Simplify
$m^2+2mn-4m-mn-2n^2+4n+km+2kn-4k$
Combine like terms
$m^2+mn-4m-2n^2+4n+km+2k-4k$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.3 Polynomials - R.3 Exercises - Page 33: 63
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