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91Ó°ÊÓ

Find the quotient and remainder using synthetic division. $$\frac{x^{3}-9 x^{2}+27 x-27}{x-3}$$

Short Answer

Expert verified
The quotient is \(x^2 - 6x + 9\) with a remainder of 0.

Step by step solution

01

Setup Synthetic Division

For synthetic division, write down the coefficients of the polynomial: 1 for \(x^3\), -9 for \(x^2\), 27 for \(x\), and -27 as the constant. Since we are dividing by \(x-3\), write 3 to the left.
02

Bring Down the First Coefficient

Bring down the first coefficient (1) to the bottom row unchanged. This is the starting point for calculating the rest of the coefficients.
03

Multiply and Add

Multiply the number brought down (1) by the divisor (3), and place the result (3) under the next coefficient (-9). Add -9 and 3 to get -6. Write -6 in the row below.
04

Repeat Multiplication and Addition

Continue the process: Multiply -6 by 3 to get -18. Place this under 27 and add to get 9. Write 9 in the row below.
05

Final Multiply and Add

Multiply 9 by 3 to get 27. Place this under -27, add, and write 0 in the row below. This 0 is the remainder.
06

Read the Quotient and Remainder

The bottom row numbers represent the coefficients of the quotient: 1 for \(x^2\), -6 for \(x\), and 9 as the constant term. The last number 0 is the remainder. Thus, the quotient is \(x^2 - 6x + 9\) and the remainder is 0.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Polynomial Division
Polynomial division is a method for breaking down complex polynomial expressions into simpler components. Think of it as a process similar to long division with numbers, but instead we're working with expressions that include variables such as \(x\). In our exercise, we are dealing with a polynomial division of the form \( \frac{x^{3}-9 x^{2}+27 x-27}{x-3} \). This means we want to find out
  • how many times the divisor \((x-3)\) fits into the dividend \((x^3-9x^2+27x-27)\)
  • and what remains once the division is complete.
Each time we "fit" the divisor into a section of the polynomial, we produce part of the quotient. Eventually, the coefficient values of the quotient, along with any leftover, give us the solution. This is what synthetic division helps us achieve in a more practical manner.
Quotient and Remainder
The terms "quotient" and "remainder" refer to the results received from dividing one polynomial by another. The quotient is the main result, or how many times the divisor fits into the dividend in polynomial terms. The remainder is what's left over after all possible times have been accounted for.
For our problem, when synthetic division is used, the quotient is represented by a new polynomial constructed from the bottom row of the synthetic division process. In this exercise, the quotient obtained is \(x^2 - 6x + 9\).
On the other hand, the remainder in polynomial division is what's left after the full division is done. Here, the remainder is 0, which means \(x-3\) divides \(x^{3}-9x^{2}+27x-27\) exactly with no left over. Having a remainder of 0 signifies that \((x-3)\) is a factor of the polynomial.
Coefficients of Polynomials
Coefficients in polynomials are the numerical values in front of the terms. They are vital as they determine how each term contributes to the polynomial's value. For example, in the polynomial \(x^3 - 9x^2 + 27x - 27\), the coefficients are 1, -9, 27, and -27, respectively.
These coefficients become key players in synthetic division. First, they are noted horizontally in order from the highest term to the constant. Next, computations occur as these coefficients are manipulated by the divisor, step by step, to ultimately yield the coefficients of the quotient. In our case, the new coefficients 1, -6, and 9 build the quotient polynomial \(x^2 - 6x + 9\). Understanding the role of coefficients can turn synthetic division into a manageable tool for polynomial arithmetic, revealing both the quotient and remainder efficiently.

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Most popular questions from this chapter

Graph the rational function \(f\), and determine all vertical asymptotes from your graph. Then graph \(f\) and \(g\) in a sufficiently large viewing rectangle to show that they have the same end behavior. $$f(x)=\frac{2 x^{2}+6 x+6}{x+3}, \quad g(x)=2 x$$

A solar panel manufacturer estimates that the profit \(y\) (in dollars) generated by producing \(x\) solar panels per month is given by the equation $$S(x)=8 x+0.8 x^{2}-0.002 x^{3}-4000$$ Graph the function in the viewing rectangle \([0,400]\) by \([-10,000,20,000] .\) For what range of values of \(x\) is the company's profit greater than \(\$ 12,000 ?\)

Graph the rational function \(f\), and determine all vertical asymptotes from your graph. Then graph \(f\) and \(g\) in a sufficiently large viewing rectangle to show that they have the same end behavior. $$f(x)=\frac{x^{3}-2 x^{2}+16}{x-2}, g(x)=x^{2}$$

Graph the rational function, and find all vertical asymptotes, \(x\) - and \(y\) -intercepts, and local extrema, correct to the nearest tenth. Then use long division to find a polynomial that has the same end behavior as the rational function, and graph both functions in a sufficiently large viewing rectangle to verify that the end behaviors of the polynomial and the rational function are the same. $$y=\frac{2 x^{2}-5 x}{2 x+3}$$

Graph the rational function \(f\), and determine all vertical asymptotes from your graph. Then graph \(f\) and \(g\) in a sufficiently large viewing rectangle to show that they have the same end behavior. $$f(x)=\frac{-x^{4}+2 x^{3}-2 x}{(x-1)^{2}}, \quad g(x)=1-x^{2}$$

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