Chapter 5: Problem 10
Multiply using the FOIL method. See Examples I through 3. $$ (6 x+2)(x-2) $$
Short Answer
Expert verified
The product is \(6x^2 - 10x - 4\).
Step by step solution
01
Understand the FOIL Method
The FOIL method is a technique used to multiply two binomials. FOIL stands for First, Outer, Inner, Last, referring to the terms we need to multiply together: the First terms in each binomial, the Outer terms, the Inner terms, and the Last terms.
02
Multiply the First Terms
Multiply the first terms of each binomial: \(6x\) from \((6x + 2)\) and \(x\) from \((x - 2)\). \[6x \times x = 6x^2\].
03
Multiply the Outer Terms
Multiply the outer terms: \(6x\) from \((6x + 2)\) and \(-2\) from \((x - 2)\). \[6x \times (-2) = -12x\].
04
Multiply the Inner Terms
Multiply the inner terms: \(2\) from \((6x + 2)\) and \(x\) from \((x - 2)\). \[2 \times x = 2x\].
05
Multiply the Last Terms
Multiply the last terms: \(2\) from \((6x + 2)\) and \(-2\) from \((x - 2)\). \[2 \times (-2) = -4\].
06
Combine All Terms
Add all the products from the previous steps together: \(6x^2\), \(-12x\), \(2x\), and \(-4\). Combine like terms: \[6x^2 + (-12x + 2x) - 4 = 6x^2 - 10x - 4\].
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Binomials
In algebra, a binomial is an algebraic expression containing exactly two terms. It's like a couple working together in a set. Each term in a binomial can either be a number, a variable, or a combination of both. For example, in the expression \(6x + 2\), this is a binomial that consists of two terms: \(6x\) and \(2\). Similarly, \(x - 2\) is also a binomial.
- The first term can contain a variable, such as \(6x\).
- The second term can be a constant, like \(2\) in our example.
Polynomial Multiplication
Polynomial multiplication involves operations between polynomials, of which binomial multiplication is a specific subset. In our exercise, we are multiplying two binomials: \((6x + 2)(x - 2)\).
- The FOIL method is a handy tool here. By using it, we ensure that each term of one binomial pairs with each term of the other.
- This multiplication is systematic and follows a sequence: First, Outer, Inner, and Last terms get multiplied.
Algebra Techniques
Algebra techniques are methods and strategies used to manipulate mathematical expressions. The FOIL method is a specific technique within algebra that simplifies the process of multiplying binomials. It's a straightforward method if followed properly as it avoids errors that might arise from forgetting terms.
- First, identify the appropriate terms in binomials—this helps structure your equation correctly.
- Perform operations in an orderly manner: First, Outer, Inner, then Last.
- Always combine like terms to simplify the result. This step is crucial for obtaining the final, simplest form of a polynomial.