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Adding and subtracting Polynomials
Lesson 8-1
TOPIC IX: Quadratic Equations and Functions
POLYNOMIALS
What does each prefix mean?mono
onebi
twotri
three
MONOMIALMonomial is a real number, a variable, or a product of a real number and one or more variables with whole-number exponent.Here are some examples of monomials
18 𝑧−4 𝑥22.5 𝑥 𝑦2𝑎3
What about poly?
one or moreA polynomial is a monomial or a sum/difference of monomials.
POLYNOMIAL
Important Note!!An expression is not a polynomial if there
is a variable in the denominator.
You can name a polynomial based on its degree or the number of monomials it contains
State whether each expression is a polynomial. If it is, identify it.
1) 7y - 3x + 4trinomial
2) 10x3yz2
monomial3)
not a polynomial2
57
2y
y
Which polynomial is represented by
X2
11
X
XX
1. x2 + x + 12. x2 + x + 23. x2 + 2x + 24. x2 + 3x + 25. I’ve got no idea!
The degree of a monomial is the sum of the exponents of the variables.
Find the degree of each monomial.1) 5x2 22) 4a4b3c 83) -3 0
DEGREE OF A POLYNOMIAL
To find the degree of a polynomial, find the largest degree of the terms.
1) 8x2 - 2x + 7Degrees: 2 1 0Which is biggest?
2) y7 + 6y4 + 3x4m4
Degrees: 7 4 8
2 is the degree!
8 is the degree!
Find the degree of x5 – x3y2 + 4
1. 02. 23. 34. 55. 10
A polynomial is normally put in ascending or descending order.
What is ascending order?Going from small to big exponents.
What is descending order?Going from big to small exponents.
Means that the degrees of its monomial term decrease from left to right
STANDARD FORM OF A POLYNOMIAL
Put in descending order:
1) 8x - 3x2 + x4 - 4 x4 - 3x2 + 8x - 4
2) Put in descending order in terms of x:12x2y3 - 6x3y2 + 3y - 2x
-6x3y2 + 12x2y3 - 2x + 3y
3) Put in ascending order in terms of y: 12x2y3 - 6x3y2 + 3y - 2x
-2x + 3y - 6x3y2 + 12x2y3
4) Put in ascending order:5a3 - 3 + 2a - a2
-3 + 2a - a2 + 5a3
Write in ascending order in terms of y:x4 – x3y2 + 4xy – 2x2y3
1. x4 + 4xy – x3y2– 2x2y3
2. – 2x2y3 – x3y2 + 4xy + x4 3. x4 – x3y2– 2x2y3 + 4xy
4. 4xy – 2x2y3 – x3y2 + x4
Adding and Subtracting Polynomials
You can add and subtract monomial by adding and subtracting like terms. Examples:
• =
• =
A polynomial is a monomial or a sum of monomial. The following polynomial is the sum of the monomial ,
3 𝑥4+5 𝑥2−7 𝑥+1
4210Degree of
each monomial
You can add polynomials by adding like terms
What is the simpler form of12)
12 8
Line up like terms then add the coefficients
Method 1 – Add vertically
ADDING POLYNOMIAL
Method 2 – Add horizontally
12)= 812
Group like terms then add the coefficients
Recall that subtraction means to add the opposite. So when you subtract a polynomial, change each of the term to its opposite. Then add the coefficients
What is the simpler form of12)
12
Line up like terms
Method 1 – Subtract vertically
12
Then add the opposite of each term in the polynomial being
subtracted
SUBTRACTING POLYNOMIAL
What is the simpler form of12)
( )
Method 2 – Subtract horizontally
Write the opposite of each term in the polynomial being
subtracted
SUBTRACTING POLYNOMIAL
=
= (
=
Group like term
Simplify
1. Add the following polynomials:(9y - 7x + 15a) + (-3y + 8x - 8a)
Group your like terms.(9y - 3y) + (- 7x + 8x) + (15a - 8a)
= 6y + x + 7a
Examples:
Combine your like terms.(3a2) + (3ab + 4ab) + (6b2 - b2)
3a2 + 7ab + 5b2
2. Add the following polynomials:(3a2 + 3ab - b2) + (4ab + 6b2)
Add the polynomials.+
X2
11XX
XYYY
YY
1 11
XYY
Y 111
1. x2 + 3x + 7y + xy + 82. x2 + 4y + 2x + 33. 3x + 7y + 84. x2 + 11xy + 8
Line up your like terms. 4x2 - 2xy + 3y2
+ -3x2 - xy + 2y2
_________________________
x2 - 3xy + 5y2
3. Add the following polynomials using column form (vertically):
(4x2 - 2xy + 3y2) + (-3x2 - xy + 2y2)
Rewrite subtraction as adding the opposite.
9y - 7x + 15a + 3y - 8x + 8aGroup the like terms.
9y + 3y -7x - 8x + 8a +15a12y - 15x + 23a
4. Subtract the following polynomials:(9y - 7x + 15a) - (-3y + 8x - 8a)
Rewrite subtraction as adding the opposite.
(7a - 10b) + (- 3a - 4b)Group the like terms.
7a - 3a - 10b - 4b4a - 14b
5. Subtract the following polynomials:(7a - 10b) - (3a + 4b)
Line up your like terms and add the opposite
4x2 - 2xy + 3y2
+ (+ 3x2 + xy - 2y2) 7x2 - xy + y2
6. Subtract the following polynomials using column form:
(4x2 - 2xy + 3y2) - (-3x2 - xy + 2y2)
Find the sum or difference.(5a – 3b) + (2a + 6b)
1. 3a – 9b2. 3a + 3b3. 7a + 3b4. 7a – 3b
Find the sum or difference.(5a – 3b) – (2a + 6b)
1. 3a – 9b2. 3a + 3b3. 7a + 3b4. 7a – 9b