Answer
$s^2-12st$.
Work Step by Step
The given polynomial is
$=(2s^2-5st-t^2)-(s^2+7st-t^2)$
Clear the parentheses.
$=2s^2-5st-t^2-s^2-7st+t^2$
Group like terms.
$=2s^2-s^2-5st-7st-t^2+t^2$
Combine like terms.
$=s^2-12st$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 7 - Polynomial Equations and Factoring - 7.1 - Adding and Subtracting Polynomials - Exercises - Page 363: 43
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