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This module is from Elementary Algebra by Denny Burzynski and Wade Ellis, Jr. Operations with algebraic expressions and numerical evaluations are introduced in this chapter. Coefficients are described rather than merely defined. Special binomial products have both literal and symbolic explanations and since they occur so frequently in mathematics, we have been careful to help the student remember them. In each example problem, the student is "talked" through the symbolic form.Objectives of this module: understand the concept of like terms, be able to combine like terms, be able to simplify expressions containing parentheses.

Overview

  • Like Terms
  • Combining Like Terms
  • Simplifying Expressions Containing Parentheses

Like terms

Like terms

Terms whose variable parts, including the exponents, are identical are called like terms . Like terms is an appropriate name since terms with identical variable parts and different numerical coefficients represent different amounts of the same quantity. As long as we are dealing with quantities of the same type we can combine them using addition and subtraction.

Simplifying an algebraic expression

An algebraic expression can be simplified by combining like terms.

Sample set a

Combine the like terms.

6 houses + 4 houses = 10 houses . 6 and 4 of the same type give 10 of that type.

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6 houses + 4 houses + 2 motels = 10 houses + 2 motels . 6 and 4 of the same type give 10 of that type. Thus, we have 10 of one type and 2 of another type.

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Suppose we let the letter x represent "house." Then, 6 x + 4 x = 10 x . 6 and 4 of the same type give 10 of that type.

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Suppose we let x represent "house" and y represent "motel."

6 x + 4 x + 2 y = 10 x + 2 y

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Practice set a

Like terms with the same numerical coefficient represent equal amounts of the same quantity.

Like terms with different numerical coefficients represent .

different amounts of the same quantity

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Combining like terms

Since like terms represent amounts of the same quantity, they may be combined, that is, like terms may be added together.

Sample set b

Simplify each of the following polynomials by combining like terms.

2 x + 5 x + 3 x .
There are 2 x ' s , then 5 more, then 3 more. This makes a total of 10 x ' s .

2 x + 5 x + 3 x = 10 x

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7 x + 8 y 3 x .
From 7 x ' s , we lose 3 x ' s . This makes 4 x ' s . The 8 y ' s represent a quantity different from the x ' s and therefore will not combine with them.

7 x + 8 y 3 x = 4 x + 8 y

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4 a 3 2 a 2 + 8 a 3 + a 2 2 a 3 .
4 a 3 , 8 a 3 , and 2 a 3 represent quantities of the same type.

4 a 3 + 8 a 3 2 a 3 = 10 a 3

2 a 2 and a 2 represent quantities of the same type.

2 a 2 + a 2 = a 2

Thus,

4 a 3 2 a 2 + 8 a 3 + a 2 2 a 3 = 10 a 3 a 2

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Practice set b

Simplify each of the following expressions.

5 a + 2 b + 4 a b 7 b

9 a 6 b

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10 x 3 4 x 3 + 3 x 2 12 x 3 + 5 x 2 + 2 x + x 3 + 8 x

5 x 3 + 8 x 2 + 10 x

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2 a 5 a 5 + 1 4 a b 9 + 9 a b 2 3 a 5

5 a b 13

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Simplifying expressions containing parentheses

Simplifying expressions containing parentheses

When parentheses occur in expressions, they must be removed before the expression can be simplified. Parentheses can be removed using the distributive property.

Distributive property

The product of a monomial a and a binomial b plus c is equal to ab plus ac. This is the distributive property. In the expression, there are two arrows originating from the monomial, a, and pointing towards the terms b and c of the binomial.

Sample set c

Simplify each of the following expressions by using the distributive property and combining like terms.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Elementary algebra. OpenStax CNX. May 08, 2009 Download for free at http://cnx.org/content/col10614/1.3
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