In Exercises 67–82, find each product. (7x2 y+1)(2x2 y−3)

Ch. P - Fundamental Concepts of Algebra

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Blitzer 8th Edition

Ch. P - Fundamental Concepts of Algebra

Problem 72

Chapter 1, Problem 72

In Exercises 67–82, find each product. (7x² y+1)(2x² y−3)

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Distribute each term in the first polynomial $(7x^2y + 1)$ to each term in the second polynomial $(2x^2y - 3)$. This is done using the distributive property $(a + b)(c + d) = ac + ad + bc + bd$.

Multiply the first term $7x^2y$ in the first polynomial by the first term $2x^2y$ in the second polynomial. This gives $7x^2y \cdot 2x^2y = 14x^4y^2$.

Multiply the first term $7x^2y$ in the first polynomial by the second term $-3$ in the second polynomial. This gives $7x^2y \cdot -3 = -21x^2y$.

Multiply the second term $1$ in the first polynomial by the first term $2x^2y$ in the second polynomial. This gives $1 \cdot 2x^2y = 2x^2y$.

Multiply the second term $1$ in the first polynomial by the second term $-3$ in the second polynomial. This gives $1 \cdot -3 = -3$. Combine all the terms from the previous steps to form the expanded polynomial.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Polynomial Multiplication

Polynomial multiplication involves distributing each term in one polynomial to every term in another polynomial. This process is often referred to as the distributive property, where you multiply coefficients and add the exponents of like bases. Understanding this concept is crucial for correctly expanding the product of polynomials.

Combining Like Terms

After multiplying polynomials, the next step is to combine like terms, which are terms that have the same variable raised to the same power. This simplification is essential for expressing the final result in its simplest form. Recognizing and correctly combining these terms ensures accuracy in the final polynomial expression.

Exponents and Their Rules

Exponents represent repeated multiplication of a base number. When multiplying terms with the same base, the exponents are added together. Familiarity with exponent rules, such as the product of powers rule, is vital for correctly handling terms during polynomial multiplication and ensuring the final expression is simplified properly.

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