Answer
a difference of cubes
Work Step by Step
Both terms of the given expression, $
s^{21}-t^{15}
,$ are perfect cubes and their coefficients have $\text{
opposite signs
}.$ Hence, the given expression is $\text{
a difference of cubes
}.$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 5 - Polynomials and Factoring - 5.5 Factoring Sums or Differences of Cubes - 5.5 Exercise Set - Page 338: 9
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