Radical Expressions And Rational Exponents Page 3
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35.6 Radical Expressions and Rational Exponents
Algebra 2
Example 7: Radium-226 is a form of a radioactive element that decays over time. An initial sample of radium-
226 has a mass of 500 mg. The mass of radium-226 remaining from the initial sample after t years is given by
)
(
−
t
500 2
1600
. To the nearest milligram, how much radium-226 would be left after 800 years?
Question for understanding:
•
How can you rewrite an expression with a negative exponent so that the exponent is positive?
o Rewrite the expression in example 7 with a positive exponent.
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