Remainder And Factor Theorems
Akopọ
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.
Awọn Afojusun
- Know and use the remainder and factor theorems.
- Find factors of polynomials and solve cubic equations.
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Oriire fun ipari ẹkọ lori Remainder And Factor Theorems. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- 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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Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
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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