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M3201Ch.6notes.notebook 1 March 20, 2014

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Page 1: M3201Ch.6notes.notebook March 20, 2014tonymercer.weebly.com/uploads/2/6/4/5/26457557/m... · M3201Ch.6notes.notebook 18 March 20, 2014 Problem Solving: Exponential expressions result

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6.3 Solving Exponential EquationsCase One:  Bases are equalExample:  SolveA)  3x = 33 B)  2x = 2­4   C)  4x = 43x + 6

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y = 2x ­ 1x  y 

­2

­1

1

y = 8

Solution:  

Case Two:  Bases are powers of one anothereg  9 can be written as a power of 3 :  9 = 32

Graphically solve:  2x­1 = 8Step one:  Write each part of the equation as an equationy = 2x ­ 1   and y = 8

Step Two:  Graph both functions on the same axis and find the intersection point.

Algebraically solve:   2x ­ 1  = 8  

Step one: Make both sides of the equation have the same base

Step two:  Relate the exponents and solve for x

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Exponential Equations with Radicals:

Remember:    is  

Solve:

Example:  Find the error

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Exponents with fractional bases:

Remember    ½  = 2­1

Example:  Solve

Example:  Solve the following equations

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Problem Solving:Exponential expressions result from the fact that a quantity changes by the same amount each time:• a population doubles each year• a bank account increases by 0.1% annually• a mass of a radioactive element decreases by 

half every 462 years

Example:

t  0  1  2  3  4  5 

P(t) 

What does the value at t = 0 indicate?

How often does the number of trout double?

Solve algebraically

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Half­life problem:

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