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When \(2 x^{2}-7 x+9\) is divided by a polynomial, the quotient is \(2 x-3\) and the remainder is \(3 .\) Find the polynomial.

Short Answer

Expert verified
Thus, the required polynomial is \(4x^{3} - 20x^{2} + 27x - 24\).

Step by step solution

01

Understand the Problem

From the problem, we know that \(2x^{2} - 7x + 9\) is the divisor, \(2x - 3\) is the quotient and 3 is the remainder. Our task is to find the dividend (the polynomial to be divided). We will use the formula \(dividend = (divisor \times quotient) + remainder\).
02

Calculate the Product of Divisor and Quotient

Multiply the divisor \(2x^{2} - 7x + 9\) with the quotient \(2x - 3\). This results in \(4x^{3} - 20x^{2} + 27x -27\) (obtained by multiplying each term of the divisor with each term of the quotient and then adding them up).
03

Calculate the Polynomial

Now, we add the product from Step 2 with the remainder 3. Therefore, adding \(4x^{3} - 20x^{2} + 27x -27\) with 3 gives us the polynomial \(4x^{3} - 20x^{2} + 27x - 24\). This is our answer.

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Key Concepts

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

Polynomial Long Division
Imagine you're splitting a pizza into equal parts. Polynomial long division isn't too different; it's a method used to divide a polynomial (the 'pizza') by another polynomial (the 'number of parts'). It's similar to the long division of numbers, but instead of numbers, we deal with variables and their exponents. To perform polynomial long division, we divide the highest degree term of the dividend by the highest degree term of the divisor, write down the result as the first term of the quotient, and subtract it from the dividend to find the remainder. This process repeats with the new dividend (initial remainder) until the degree of the remainder is less than the degree of the divisor. The concept is the foundation of algebra and appears in many mathematical scenarios, such as solving equations and simplifying functions.
Divisor
In our polynomial division scenario, the divisor plays the role of the 'how many' in our equation. It's the polynomial by which we're dividing our dividend. In other words, just like you would divide a number by another number, with polynomials, we're dividing one expression by another. The result of this process will include a quotient and possibly a remainder. The divisor is an essential element of our division problem, and its degree (the highest exponent in its terms) is crucial to carry out the division process correctly.
Quotient
When we divide two numbers, we get a result called the quotient. Similarly, in polynomial division, the quotient is the 'answer' we get when we divide one polynomial by another, without considering the remainder. Think of it like getting whole numbers when you share cookies with friends - the quotient is how many cookies everyone gets before you consider any leftovers.
Remainder
The remainder in polynomial division is what's left over after dividing the dividend by the divisor as far as possible without going into fractions or decimals. It's like when you distribute all the slices of pizza equally, and you're left with a single slice - that's your remainder. In polynomial division, if you can't divide any further because the degree of what's left is less than the degree of the divisor, you've found your remainder.
Algebra
Algebra is the branch of mathematics that deals with symbols and the rules for manipulating those symbols; it is a unifying thread of almost all of mathematics. It gives us the tools to describe and understand relationships, changes, and patterns using mathematical expressions and equations. Polynomial division is a practical example of algebra at work. In the given exercise, we manipulate algebraic expressions to find an unknown polynomial, showcasing how algebra allows us to break down complex problems into solvable steps.

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Most popular questions from this chapter

a. If \(y=\frac{k}{x},\) find the value of \(k\) using \(x=8\) and \(y=12\) b. Substitute the value for \(k\) into \(y=\frac{k}{x}\) and write the resulting equation. c. Use the equation from part (b) to find \(y\) when \(x=3\)

A company is planning to manufacture mountain bikes. The fixed monthly cost will be \(\$ 100,000\) and it will cost \(\$ 100\) to produce each bicycle. a. Write the cost function, \(C,\) of producing \(x\) mountain bikes. b. Write the average cost function, \(\bar{C},\) of producing \(x\) mountain bikes. c. Find and interpret \(\bar{C}(500), \bar{C}(1000), \bar{C}(2000),\) and \(\bar{C}(4000)\) d. What is the horizontal asymptote for the graph of the average cost function, \(C ?\) Describe what this means in practical terms.

Determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. The inequality \(\frac{x-2}{x+3}<2\) can be solved by multiplying both sides by \((x+3)^{2}, x \neq-3,\) resulting in the equivalent inequality \((x-2)(x+3)<2(x+3)^{2}\)

Write the equation of each parabola in standard form. Find the point on the line whose equation is \(2 x+y-2=0\) that is closest to the origin. Hint: Minimize the distance function by minimizing the expression under the square root.

Use long division to rewrite the equation for \(g\) in the form quotient \(+\frac{\text { remainder }}{\text { divisor }}\) Then use this form of the function's equation and transformations of \(f(x)=\frac{1}{x}\) to graph \(g\) $$g(x)=\frac{2 x-9}{x-4}$$

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