Answer
The negative exponent shows repeated division.
Work Step by Step
For example if y=400$\times$$20^{x}$
If x=-2
y=400$\times$$20^{x}$ = 400$\times$$20^{-2}$ = $\frac{400}{20^{2}}$ = $\frac{400}{20\times20}$ = $\frac{20}{20}$ = 1
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 7 - Exponents and Exponential Functions - 7-1 Zero and Negative Exponents - Lesson Check - Page 421: 7
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