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Adding and Subtracting Rational Expression  Problem 5
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
A common type of word problem in math is called a "work" word problem, where you're asked to find the total time it takes for two individuals to finish a job together, or perhaps if you know the time together, then how long it would take one individual. One way to set up a rational equation to solve this is to write the part person 1 can do in one hour times total time, plus the part person 2 can do in one hour times the total time, and set it equal to one. You'll need to find a common denominator and simplify the left side, but you can use this set up to solve for any variable in this scenario.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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Sample Problems (6)
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Adding and Subtracting Rational Expression
Problem 1 7,128 viewsAdd and Simplify:
3x² + 6x x + 2 x + 2 
Adding and Subtracting Rational Expression
Problem 2 6,158 viewsSimplify:
7m − 2 − 5m − 6 m² + 3m + 2 m² + 3m + 2 
Adding and Subtracting Rational Expression
Problem 3 5,912 viewsSimplify:
4 + x² + x x + 3 x² + 4x + 3 
Adding and Subtracting Rational Expression
Problem 4 5,055 viewsSimplify:
x − x x² − 16 x² + 8x + 16 
Adding and Subtracting Rational Expression
Problem 5 604 views 
Adding and Subtracting Rational Expression
Problem 6 219 views
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