Remainder And Factor Theorems
Muhtasari
Dividing one polynomial by another can be slow. The remainder and factor theorems give you a shortcut so powerful it feels like cheating: you can find the remainder of a division, or test whether something is a factor, just by substituting a single number. No long division required.
In this lesson you will meet the remainder theorem, which says the remainder when a polynomial is divided by \((x-a)\) is simply \(f(a)\), and the factor theorem, its special case when that remainder is zero. Together they are the key to factorising and solving cubic equations, a staple of the higher-level syllabus.
Malengo
- Know and use the remainder and factor theorems.
- Find factors of polynomials and solve cubic equations.
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- What is the remainder when f(x) = x^3 - 2x^2 + 5x - 1 is divided by (x - 2)? A. 0 B. 5 C. 9 D. 11 Answer: C
- By the factor theorem, (x - a) is a factor of f(x) when: A. f(0) = a B. f(a) = 0 C. f(a) = 1 D. f(1) = a Answer: B
- Is (x - 1) a factor of f(x) = x^3 - 6x^2 + 11x - 6? A. Yes, because f(1) = 0 B. No, because f(1) = 6 C. Yes, because f(0) = -6 D. No, because f(1) = 1 Answer: A
- The full factorisation of x^3 - 6x^2 + 11x - 6 is: A. (x - 1)(x - 2)(x - 3) B. (x + 1)(x + 2)(x + 3) C. (x - 1)^3 D. (x - 2)(x - 3)(x - 6) Answer: A
- What is the remainder when f(x) = x^2 + 3x + 2 is divided by (x + 2)? A. 0 B. 2 C. 6 D. 12 Answer: A
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Sehemu ya kitabu
Zeros of Polynomial Functions
Evaluate a polynomial using the Remainder Theorem.
"Algebra and Trigonometry: Zeros of Polynomial Functions" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/algebra-and-trigonometry/pages/5-5-zeros-of-polynomial-functions. Access for free at https://openstax.org/books/algebra-and-trigonometry/pages/1-introduction
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