Precalculus (6th Edition)

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: 64

Answer

$2r^2-7rs+3rt+3s^2-4st+t^2$

Work Step by Step

$(r-3s+t)(2r-s+t)=r(2r-s+t)-3s(2r-s+t)+t(2r-s+t)=2r^2-rs+rt-6rs+3s^2-3st+2rt-st+t^2=2r^2-7rs+3rt+3s^2-4st+t^2$
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