Exercises 73–75 will help you prepare for the material covered in the next section. Rationalize the denominator: (7 + 4√2)/(2 - 5√2).
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
1. Equations & Inequalities
Rational Equations
Problem 106a
Textbook Question
Solve each equation. - 2{7 - [4 -2(1 - x) + 3]} = 10 - [4x - 2(x - 3)]
Verified step by step guidance1
Distribute the -2 inside the parentheses on the left-hand side: -2(1 - x) becomes -2 + 2x. Simplify the expression inside the brackets.
Simplify the brackets on the left-hand side: [4 - (-2 + 2x) + 3] becomes [4 + 2 - 2x + 3]. Combine like terms inside the brackets.
Simplify further on the left-hand side: [4 + 2 + 3 - 2x] becomes [9 - 2x]. Multiply the entire bracket by -2.
On the right-hand side, distribute the -2 inside the parentheses: -2(x - 3) becomes -2x + 6. Simplify the expression inside the brackets.
Combine all terms on both sides of the equation, isolate x, and solve for x by performing inverse operations (addition, subtraction, division, etc.).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Order of Operations
The order of operations is a set of rules that dictates the sequence in which mathematical operations should be performed to ensure consistent results. The acronym PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) helps remember this order. In solving equations, correctly applying these rules is crucial for simplifying expressions accurately.
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Distributive Property
The distributive property states that a(b + c) = ab + ac, allowing us to multiply a single term by each term within a set of parentheses. This property is essential for simplifying expressions and solving equations, as it helps eliminate parentheses and combine like terms effectively, making the equation easier to manage.
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Solving Linear Equations
Solving linear equations involves finding the value of the variable that makes the equation true. This process typically includes isolating the variable on one side of the equation through various algebraic manipulations, such as adding, subtracting, multiplying, or dividing both sides. Understanding how to manipulate equations is fundamental for arriving at the correct solution.
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