Chapter 6: Problem 18
Use a pattern to factor. Check. Identify any prime polynomials. $$ c^{2}-14 c d+49 d^{2} $$
Short Answer
Expert verified
(c - 7d)^2. Verified by expanding the binomial and confirming no prime polynomials remain.
Step by step solution
01
- Recognize the Square Pattern
Notice that the given polynomial is in the form of a perfect square trinomial, which can be written as c^2 - 2ab + b^2. Compare this with c^2 - 14cd + 49d^2.
02
- Break down the middle term
Here, you can observe that - 14cd actually represents the middle term . In the perfect square trinomial pattern - 2ab, the -14cd corresponds to -2ab. This implies -2ab = -14cd.
03
- Identify 'a' and 'b'
From Step 2, we can identify 'a' and 'b' such that a = c and b =7d. Hence, the expression can be written in the form a^2 + 2ab + b^2 again.
04
- Write as Perfect Square Binomial
Hence, recognizing the perfect square binomial, the expression can be factored. Factor the expression c^2 - 14cd + 49d^2 as (c -7d)^2.
05
- Check by Expanding
To verify, expand the binomial (c -7d)(c -7d) and it results back to the original polynomial Check: (c -7d)(c -7d) = c^2 - 7cd -7cd + 49d^2 =c^2 - 14cd + 49d^2.
06
- Identify Prime Polynomials
After factoring, (c -7d)^2 cannot be factored further thus is considered prime. Conclusion: The given polynomial was factors correctly without leaving any prime polynomial
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Perfect Square Trinomial
Let's start by exploring what a perfect square trinomial is and how to recognize it. In algebra, a perfect square trinomial is a special type of polynomial that takes the form \(a^2 + 2ab + b^2\) or \(a^2 - 2ab + b^2\). These can be factored into \((a + b)^2\) or \((a - b)^2\) respectively. In our example, the given polynomial is \(c^2 - 14cd + 49d^2\). Recognizing the pattern, we see it fits the form \(a^2 - 2ab + b^2\).
Here’s a step-by-step process to identify and factor it:
To check if the factorization is correct, expand \((c - 7d)^2\). You get back the original trinomial, confirming your factorization.
Here’s a step-by-step process to identify and factor it:
- Identify if the polynomial is a trinomial (three terms).
- Check if it fits the perfect square trinomial pattern.
- Compare each component with the forms \(a^2 + 2ab + b^2\) or \(a^2 - 2ab + b^2\).
To check if the factorization is correct, expand \((c - 7d)^2\). You get back the original trinomial, confirming your factorization.
Prime Polynomial
A prime polynomial is a polynomial that cannot be factored further into polynomials of lower degrees. Think of it like a prime number in arithmetic which can't be divided by any numbers other than 1 and itself. After factoring a polynomial, we always need to check whether the resulting factors can be broken down further.
In the example given, after factoring \(c^2 - 14cd + 49d^2\) into \((c - 7d)^2\), you see it's now in its simplest form. Factors like \((x + y)\) or \((x - y)\) where further factorization isn't possible indicate the polynomial is prime.
In the example given, after factoring \(c^2 - 14cd + 49d^2\) into \((c - 7d)^2\), you see it's now in its simplest form. Factors like \((x + y)\) or \((x - y)\) where further factorization isn't possible indicate the polynomial is prime.
- Factorize the polynomial into binomials.
- Check each resulting binomial to see if it can be factored further.
- If no further factorization is possible, then it's prime.
Factoring Binomials
Factoring binomials is one of the fundamental skills in algebra. It involves expressing a binomial (a polynomial with two terms) as a product of two factors. The binomials can often be further simplified to forms such as \((x + y)\) or \((x - y)\). There's a variety of methods for factoring binomials depending on the specific forms they take.
Here are some common techniques:
Here are some common techniques:
- Difference of Squares: For expressions like \(a^2 - b^2\), factor them as \((a + b)(a - b)\).
- Sum and Difference of Cubes: For \(a^3 + b^3\) and \(a^3 - b^3\), factor them as \((a + b)(a^2 - ab + b^2)\) and \((a - b)(a^2 + ab + b^2)\) respectively.
- Grouping: When you have four terms, you can sometimes group them into pairs and factor by grouping.