The Discriminant
Akopọ
Before solving a quadratic, you can already tell how many real solutions it has, just from a single number buried inside the formula. That number is the discriminant, \(b^2-4ac\), and reading its sign is one of the quickest, most powerful checks in algebra.
In this lesson you will learn what the discriminant reveals about the roots of a quadratic: two distinct roots, one repeated root, or none at all. You will then use it to answer a favourite exam question, deciding whether a straight line cuts, touches or misses a curve, all without solving the equation fully.
Awọn Afojusun
- Know the conditions for a quadratic equation to have two real roots, two equal roots or no real roots, using the discriminant.
- Use the related conditions for a given line to intersect, be a tangent to, or not intersect a given curve.
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Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori The Discriminant. 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 discriminant of a quadratic ax^2 + bx + c = 0? A. b^2 + 4ac B. b^2 - 4ac C. 4ac - b^2 D. b - 4ac Answer: B
- If b^2 - 4ac > 0, the quadratic has: A. no real roots B. one repeated root C. two distinct real roots D. infinitely many roots Answer: C
- How many real roots has 2x^2 + 3x + 5 = 0? A. 0 B. 1 C. 2 D. 3 Answer: A
- The equation x^2 - 6x + 9 = 0 has a discriminant of: A. 72 B. 36 C. 0 D. -36 Answer: C
- y = x + k is a tangent to y = x^2 when k equals: A. 1/4 B. -1/4 C. 0 D. -1 Answer: B
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Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Quadratic Equations
Solve quadratic equations by factoring.
"College Algebra: Quadratic Equations" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-algebra/pages/2-5-quadratic-equations. Access for free at https://openstax.org/books/college-algebra/pages/1-introduction
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Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa The Discriminant? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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