6.1E: Exercises
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- Jan 6, 2020
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Identify Polynomials, Monomials, Binomials, and Trinomials
In the following exercises, determine if each of the following polynomials is a monomial, binomial, trinomial, or other polynomial.
Exercise 1
- 81b5−24b3+1
- 5c3+11c2−c−8
- 1415y+17
- 5
- 4y+17
- Answer
-
- trinomial
- polynomial
- binomial
- monomial
- binomial
Exercise 2
- x2−y2
- −13c4
- x2+5x−7
- x2y2−2xy+8
- 19
Exercise 3
- 8−3x
- z2−5z−6
- y3−8y2+2y−16
- 81b5−24b3+1
- −18
- Answer
-
- binomial
- trinomial
- polynomial
- trinomial
- monomial
Exercise 4
- 11y2
- −73
- 6x2−3xy+4x−2y+y2
- 4y+17
- 5c3+11c2−c−8
Determine the Degree of Polynomials
In the following exercises, determine the degree of each polynomial.
Exercise 5
- 6a2+12a+14
- 18xy2z
- 5x+2
- y3−8y2+2y−16
- −24
- Answer
-
- 2
- 4
- 1
- 3
- 0
Exercise 6
- 9y3−10y2+2y−6
- −12p4
- a2+9a+18
- 20x2y2−10a2b2+30
- 17
Exercise 7
- 14−29x
- z2−5z−6
- y3−8y2+2y−16
- 23ab2−14
- −3
- Answer
-
- 1
- 2
- 3
- 3
- 0
Exercise 8
- 62y2
- 15
- 6x2−3xy+4x−2y+y2
- 10−9x
- m4+4m3+6m2+4m+1
Add and Subtract Monomials
In the following exercises, add or subtract the monomials.
Exercise 9
7x2+5x2
- Answer
-
12x2
Exercise 10
4y3+6y3
Exercise 11
−12w+18w
- Answer
-
6w
Exercise 12
−3m+9m
Exercise 13
4a−9a
- Answer
-
−5a
Exercise 14
−y−5y
Exercise 15
28x−(−12x)
- Answer
-
40x
Exercise 16
13z−(−4z)
Exercise 17
−5b−17b
- Answer
-
−22b
Exercise 18
−10x−35x
Exercise 19
12a+5b−22a
- Answer
-
−10a+5b
Exercise 20
14x−3y−13x
Exercise 21
2a2+b2−6a2
- Answer
-
−4a2+b2
Exercise 22
5u2+4v2−6u2
Exercise 23
xy2−5x−5y2
- Answer
-
xy2−5x−5y2
Exercise 24
pq2−4p−3q2
Exercise 25
a2b−4a−5ab2
- Answer
-
a2b−4a−5ab2
Exercise 26
x2y−3x+7xy2
Exercise 27
12a+8b
- Answer
-
12a+8b
Exercise 28
19y+5z
Exercise 29
Add: 4a,−3b,−8a
- Answer
-
−4a−3b
Exercise 30
Add: 4x,3y,−3x
Exercise 31
Subtract 5x6 from −12x6
- Answer
-
−17x6
Exercise 32
Subtract 2p4 from −7p4
Add and Subtract Polynomials
In the following exercises, add or subtract the polynomials.
Exercise 33
(5y2+12y+4)+(6y2−8y+7)
- Answer
-
11y2+4y+11
Exercise 34
(4y2+10y+3)+(8y2−6y+5)
Exercise 35
(x2+6x+8)+(−4x2+11x−9)
- Answer
-
−3x2+17x−1
Exercise 36
(y2+9y+4)+(−2y2−5y−1)
Exercise 37
(8x2−5x+2)+(3x2+3)
- Answer
-
11x2−5x+5
Exercise 38
(7x2−9x+2)+(6x2−4)
Exercise 39
(5a2+8)+(a2−4a−9)
- Answer
-
6a2−4a−1
Exercise 40
(p2−6p−18)+(2p2+11)
Exercise 41
(4m2−6m−3)−(2m2+m−7)
- Answer
-
2m2−7m+4
Exercise 42
(3b2−4b+1)−(5b2−b−2)
Exercise 43
(a2+8a+5)−(a2−3a+2)
- Answer
-
11a+3
Exercise 44
(b2−7b+5)−(b2−2b+9)
Exercise 45
(12s2−15s)−(s−9)
- Answer
-
12s2−16s+9
Exercise 46
(10r2−20r)−(r−8)
Exercise 47
Subtract (9x2+2) from (12x2−x+6)
- Answer
-
3x2−x+4
Exercise 48
Subtract (5y2−y+12) from (10y2−8y−20)
Exercise 49
Subtract (7w2−4w+2) from (8w2−w+6)
- Answer
-
w2+3w+4
Exercise 50
Subtract (5x2−x+12) from (9x2−6x−20)
Exercise 51
Find the sum of (2p3−8) and (p2+9p+18)
- Answer
-
2p3+p2+9p+10
Exercise 52
Find the sum of
(q2+4q+13) and (7q3−3)
Exercise 53
Find the sum of (8a3−8a) and (a2+6a+12)
- Answer
-
8a3+a2−2a+12
Exercise 54
Find the sum of
(b2+5b+13) and (4b3−6)
Exercise 55
Find the difference of
(w2+w−42) and
(w2−10w+24).
- Answer
-
11w−66
Exercise 56
Find the difference of
(z2−3z−18) and
(z2+5z−20)
Exercise 57
Find the difference of
(c2+4c−33) and
(c2−8c+12)
- Answer
-
12c−45
Exercise 58
Find the difference of
(t2−5t−15) and
(t2+4t−17)
Exercise 59
(7x2−2xy+6y2)+(3x2−5xy)
- Answer
-
10x2−7xy+6y2
Exercise 60
(−5x2−4xy−3y2)+(2x2−7xy)
Exercise 61
(7m2+mn−8n2)+(3m2+2mn)
- Answer
-
10m2+3mn−8n2
Exercise 62
(2r2−3rs−2s2)+(5r2−3rs)
Exercise 63
(a2−b2)−(a2+3ab−4b2)
- Answer
-
−3ab+3b2
Exercise 64
(m2+2n2)−(m2−8mn−n2)
Exercise 65
(u2−v2)−(u2−4uv−3v2)
- Answer
-
4uv+2v2
Exercise 66
(j2−k2)−(j2−8jk−5k2)
Exercise 67
(p3−3p2q)+(2pq2+4q3)−(3p2q+pq2)
- Answer
-
p3−6p2q+pq2+4q3
Exercise 68
(a3−2a2b)+(ab2+b3)−(3a2b+4ab2)
Exercise 69
(x3−x2y)−(4xy2−y3)+(3x2y−xy2)
- Answer
-
x3+2x2y−5xy2+y3
Exercise 70
(x3−2x2y)−(xy2−3y3)−(x2y−4xy2)
Evaluate a Polynomial for a Given Value
In the following exercises, evaluate each polynomial for the given value.
Exercise 71
Evaluate 8y2−3y+2 when:
- y=5
- y=−2
- y=0
- Answer
-
- 187
- 46
- 2
Exercise 72
Evaluate 5y2−y−7 when:
- y=−4
- y=1
- y=0
Exercise 73
Evaluate 4−36x when:
- x=3
- x=0
- x=−1
- Answer
-
- −104
- 4
- 40
Exercise 74
Evaluate 16−36x2 when:
- x=−1
- x=0
- x=2
Exercise 75
A painter drops a brush from a platform 75 feet high. The polynomial −16t2+75 gives the height of the brush t seconds after it was dropped. Find the height after t=2 seconds.
- Answer
-
11
Exercise 76
A girl drops a ball off a cliff into the ocean. The polynomial −16t2+250 gives the height of a ball t seconds after it is dropped from a 250-foot tall cliff. Find the height after t=2 seconds.
Exercise 77
A manufacturer of stereo sound speakers has found that the revenue received from selling the speakers at a cost of p dollars each is given by the polynomial −4p2+420p. Find the revenue received when p=60 dollars.
- Answer
-
$10,800
Exercise 78
A manufacturer of the latest basketball shoes has found that the revenue received from selling the shoes at a cost of p dollars each is given by the polynomial −4p2+420p. Find the revenue received when p=90 dollars.
Everyday Math
Exercise 79
Fuel Efficiency The fuel efficiency (in miles per gallon) of a car going at a speed of x miles per hour is given by the polynomial −1150x2+13x, where x=30 mph.
- Answer
-
4
Exercise 80
Stopping Distance The number of feet it takes for a car traveling at x miles per hour to stop on dry, level concrete is given by the polynomial 0.06x2+1.1x, where x=40 mph.
Exercise 81
Rental Cost The cost to rent a rug cleaner for d days is given by the polynomial 5.50d+25. Find the cost to rent the cleaner for 6 days.
- Answer
-
$58
Exercise 82
Height of Projectile The height (in feet) of an object projected upward is given by the polynomial −16t2+60t+90 where t represents time in seconds. Find the height after t=2.5 seconds.
Exercise 83
Temperature Conversion The temperature in degrees Fahrenheit is given by the polynomial 95c+32 where c represents the temperature in degrees Celsius. Find the temperature in degrees Fahrenheit when c=65°.
- Answer
-
149° F
Writing Exercises
Exercise 84
Using your own words, explain the difference between a monomial, a binomial, and a trinomial.
Exercise 85
Using your own words, explain the difference between a polynomial with five terms and a polynomial with a degree of 5.
- Answer
-
Answers will vary.
Exercise 86
Ariana thinks the sum 6y2+5y4 is 11y6
Exercise 87
Jonathan thinks that 13 and 1x are both monomials. What is wrong with his reasoning?
- Answer
-
Answers will vary.
Self Check
a. After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

b. If most of your checks were:
…confidently. Congratulations! You have achieved the objectives in this section. Reflect on the study skills you used so that you can continue to use them. What did you do to become confident of your ability to do these things? Be specific.
…with some help. This must be addressed quickly because topics you do not master become potholes in your road to success. In math every topic builds upon previous work. It is important to make sure you have a strong foundation before you move on. Who can you ask for help? Your fellow classmates and instructor are good resources. Is there a place on campus where math tutors are available? Can your study skills be improved?
…no - I don’t get it! This is a warning sign and you must not ignore it. You should get help right away or you will quickly be overwhelmed. See your instructor as soon as you can to discuss your situation. Together you can come up with a plan to get you the help you need.