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Grade 9:  The Learning Equation Math

12.03 Simplifying and Evaluating Exponential Expressions

Numbers

Number Operations

Refresher pp 22-3

 

SeekAWord2ech.class Author

Prerequisite Skills:

 

Key Terms                 

power, exponent, base, coefficient, simplify, evaluate

Interactive Component Under Construction

 

Learning Outcomes

The student will:

 

Exponent Laws

  • ^ refers to an exponent.  3^3 refers to 32.
  • use / to represent divide and * to represent multiply.
  • use + and - for add and subtract.
  • any letter can be used as a variable.

product law

xmxn = xm+n

power of a product law

(xy)m = xym

power of a power law

(xm)n =xmn

quotient law

xm/ xn = xm-n

power of a quotient law

(x/y)m = xm ym

1/x-m = xm

Exponents - Dr. Math

 

Review:

Exponential Laws

Enter expressions that match the standard form shown on the right of each law.

product law:   

power of a product law:    

power of a power law:  

quotient law

power of a quotient law: 

reciprocals

distributive property:  

xmxn = xm+n

(xy)m = xym

(xm)n =xmn

xm ¸ xn = xm-n

(x/y)m = xm / y= xmy-m

1/x-m = xm

a(x+c) = ax +ac

 

Power Property Example General Rule
addition 32 + 34 = 32 + 34

= 9 + 81 = 90

xm + xn = xm + xn

Use BEDMAS to solve.

subtraction 32 - 34 = 32 - 34

= 9 - 81 = -72

xm - xn = xm - xn

Use BEDMAS to solve.

product law 3334 = (3x3x3) (3x3x3x3)

= 33+4 = 37

xmxn = xm+n

Keep the common base, then add the exponents.

x2x6 = (xx) (xxxxxx)

= x2+6 = x8

power of a power law (22)3 = (2x2)(2x2)(2x2)

= 22x3 =26

(xm)n = xmn

Keep the base, then multiply  the exponents.

(x3)4 = (xxx)(xxx)(xxx)(xxx)

= x3x4 =312

power of a product law (3b)3 = (3b)(3b)(3b)

= (3x3x3)(bbb)

= 33b3

or

(3b)3 = (31b1)3 = 31x3b1x3 = 33b3

(xy)m = xym
(xy)4 = (xy)(xy)(xy)(xy)

= (xxxx)(yyyy)

= x4y4

or

(xy)4 = (x1y1)4 = x1x4y1x4 = x4y4

quotient law 35 ¸ 32 = (3x3x3x3x3)/(3x3)

= 35-2 = 33

xm ¸ xn = xm-n

Keep the common base, then subtract the exponents.

x6 ¸ x2 = (xxxxxx)/(xx)

= x6-2 = x4

power of a quotient law (3/b)3 = (3/b)(3/b) (3/b)

= (3x3x3) /(bbb) = 27/b3

or

(3/b)3 = (31b1)3 = 31x3/b1x3)

= 33/b3 = 27/b3

(x/y)m = xm ¸ ym
(x/y)4 =(x/y) (x/y) (x/y) (x/y)

= (xxxx) /(yyyy) = x4/y4

or

(x/y)4 = (x1/y1)4 = x1x4/y1x4 = x4/y4

negative exponents 3-4 = (1/3)4 = 1/34 x-m = (1/x)m = 1/xm
x-3 = (1/x)3 = 1/x3
1/y-4 = (y/1)4 = y4 1/x-m = xm

 

 

Enrichment:

 

 

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