Use synthetic division to determine whether the given number k is a zero of the polynomial function. If it is not, give the value of ƒ(k). ƒ(x) = 5x4 + 2x3 -x+3; k=2/5
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Dividing Polynomials
Problem 83
Textbook Question
Perform each division. See Examples 7 and 8.
Verified step by step guidance1
Identify the division problem as dividing each term in the numerator by the denominator: \(\frac{-4x^7 - 14x^6 + 10x^4 - 14x^2}{-2x^2}\).
Rewrite the expression as separate fractions for each term: \(\frac{-4x^7}{-2x^2} + \frac{-14x^6}{-2x^2} + \frac{10x^4}{-2x^2} + \frac{-14x^2}{-2x^2}\).
Simplify the coefficients by dividing the numbers in the numerator by the number in the denominator for each term.
Simplify the variables by subtracting the exponents of \(x\) in the denominator from the exponents of \(x\) in the numerator for each term, using the rule \(\frac{x^a}{x^b} = x^{a-b}\).
Write the simplified terms together to form the final expression after division.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Polynomial Division by a Monomial
Dividing a polynomial by a monomial involves dividing each term of the polynomial individually by the monomial. This simplifies the expression by reducing the degree of each term according to the division, making it easier to handle and interpret.
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Laws of Exponents
When dividing terms with the same base, subtract the exponent of the divisor from the exponent of the dividend. For example, x^7 ÷ x^2 = x^(7-2) = x^5. This rule is essential for simplifying each term correctly during division.
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Rational Exponents
Handling Negative Signs in Division
When dividing expressions with negative coefficients, apply the rule that dividing a negative by a negative yields a positive, while dividing a negative by a positive yields a negative. Correctly managing signs ensures the final simplified expression is accurate.
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