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1 EXPONENTS AND LOGARITHMS WHAT YOU NEED TO KNOW • The rules of exponents: • ma m× an = a +n • a a a m n = mn • (am)n mn= a • aa m n n m • a a n n − = 1 • an × nb = (ab)n • a b a b n n n = ⎛ ⎝⎜ ⎛ ⎝ ⎞ ⎠⎟ ⎞ ⎠ • The relationship between exponents and logarithms: • ab=⇔b xb g a where a is called the ...
we need to have some understanding of the way in which logs and exponentials work. De nition: If x and b are positive numbers and b 6= 1 then the logarithm of x to the base b is the power to which b must be raised to equal x.
EXPONENT RULES & PRACTICE 1. PRODUCT RULE: To multiply when two bases are the same, write the base and ADD the exponents. Examples: A. B. C. 2. QUOTIENT RULE: To divide when two bases are the same, write the base and SUBTRACT the exponents. Examples: A. B. ˘ C. ˇ ˇ 3.
There are three laws of logarithms which you must know. log a x + log a y = log a ( xy ) where a , x , y > 0 . If two logarithmic terms with the same base number (a above) are being added together, then the terms can be combined by multiplying the arguments (x and y above). log 5 4 ) 2 × 4 = log 5 8. where a , x , y > 0 .
Sample Exponential and Logarithm Problems 1 Exponential Problems Example 1.1 Solve 1 6 3x 2 = 36x+1. Solution: Note that 1 6 = 6 1 and 36 = 62. Therefore the equation can be written (6 1) 3x 2 = (62)x+1 Using the power of a power property of exponential functions, we can multiply the exponents: 63x+2 = 62x+2 But we know the exponential function ...
understanding the basic laws of exponents. This chapter reviews these laws before recalling exponential functions. Then it explores inverses of exponential functions, which are called logarithms. Recall that in an expression such as an in which a is raised to the power of n, the number a is called the base and n is the exponent. 5.1 Review of ...
A logarithm with a base of a positive number b is defined to be: log x y b xy b Remember, a logarithmic function is the inverse of an exponential function. The answer to b log x gives you the exponent that b needs to be raised to in order to get an answer of x. The Rules for Logarithms
