Rational Expressions and Equations
Not what you're looking for?
See attached file for full problem description.
Add/subtract and simplify:
1. 5 -4
___ + ________
c2d3 7cd2
36. 3x + 2 x - 2
_______ + ______
3x + 6 x2 - 4
50. 3(x - 2) 5(2x + 1) 3(x + 1)
_______ + ________ + ________
2x - 3 2x - 3 3 - 2x
18. 3 2
_________ _ _____________
2 2
12 + x - x x - 9
34. 4x - 6 7 - 2x
________ _ ________
x - 5 5 - x
40. a 5
_____________ - _________________________
2 2
a + 11a + 30 a + 9a + 20
Solve for x:
26. x + 1 x - 1
_______ _ _______ = 1
3 2
38. 4 2x 1
_____ + ________ = ____________
X - 3 2 - 9 x + 3
X
40. 5 30
______ - _________ = 1
y - 3 2
y - 9
51. Why is it especially important to check the possible solutions to a rational equation?
52. How can a graph be used to determine how many solutions an equation has?
8. Bobbi can pick a quart of raspberries in 20 min. Blanche can pick a quart in 25min.
How long would it take if Bobbi and Blanche worked together?
14. The speed of a freight train is 15 mph slower than the speed of a passenger train.
The freight train travels 390 mi in the same time that it takes the passenger train to
travel 480 mi. Find the speed of each train.
44. It takes 60 oz. of grass seed to seed 3000 ft of lawn. At this rate, how much would
be needed to seed 2 of lawn?
5000 ft
See attached file for full problem description.
Purchase this Solution
Solution Summary
This problem set has six problems involving simplifying rational expressions (that involve adding and subtracting fractions), three similar problems that involve solving rational equations, two discussion questions, and three word problems.
Solution Preview
Please see the attached file.
Add. Simplify if possible.
5 -4
___ + ________
c2d3 7cd2
Put both over a common denominator:
5(7) + -4 (cd)
c2d3(7) 7cd2(cd)
35 + -4cd
7c2d3 7c2d3
Add the fractions:
35 - 4cd
7c2d3
36. 3x + 2 x - 2
_______ + ______
3x + 6 x2 - 4
Put both over a common denominator:
(3x + 2)(x2 - 4) + (x - 2)(3x + 6)
(3x + 6)(x2 - 4) (x2 - 4)(3x +6)
Add the fractions:
(3x + 2)(x2 - 4) + (x - 2)(3x + 6)
(x2 - 4)(3x +6)
Notice that x2 - 4 = (x - 2)(x + 2) and 3x + 6 = 3(x + 2).
Factor:
(3x + 2)(x - 2)(x + 2) + 3(x - 2)(x + 2)
3(x + 2)(x - 2)(x + 2)
(x - 2)(x + 2) [(3x + 2) + 3]
3(x + 2)(x - 2)(x + 2)
Cancel like terms:
[(3x + 2) + 3]
3(x + 2)
Simplify:
3x + 5
3(x + 2)
50. 3(x - 2) 5(2x + 1) 3(x + 1)
_______ + ________ + ________
2x - 3 2x - 3 3 - 2x
This is the same as above. Put over a common denominator, add, and simplify:
3(x - 2) 5(2x + 1) 3(x + 1)
_______ + ________ + ________
2x - 3 2x - 3 - (2x - 3)
3(x - 2) + 5(2x + 1) - 3(x + 1)
2x - 3
3x - 6 + 10x + 5 - 3x -3
2x - 3
10x - 4
2x - 3
2(5x - 2)
2x - 3
Subtract. Simplify if possible.
18. 3 2
_________ _ _____________
2 2
12 + x - x x - 9
Look at the denominator of the first fraction: -x2 + x + 12. That's the same as -(x2 -x -12), which can be factored as -(x - 4)(x + 3). The denominator of the ...
Purchase this Solution
Free BrainMass Quizzes
Multiplying Complex Numbers
This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.
Solving quadratic inequalities
This quiz test you on how well you are familiar with solving quadratic inequalities.
Exponential Expressions
In this quiz, you will have a chance to practice basic terminology of exponential expressions and how to evaluate them.
Graphs and Functions
This quiz helps you easily identify a function and test your understanding of ranges, domains , function inverses and transformations.
Probability Quiz
Some questions on probability