Solutions Of Equations
Overview
What happens when a straight line meets a parabola, or when a cubic polynomial has roots you need to find? This topic equips you with the algebraic strategies for handling systems where at least one equation is nonlinear, and for cracking open cubic equations that contain at least one rational root.
You will learn to combine substitution with quadratic methods to solve simultaneous equations involving a line and a curve, and you will apply the factor theorem to reduce cubic equations to a product of factors you can solve completely. These techniques appear in nearly every Edexcel 4PM1 paper and carry significant marks.
Objectives
- Solve simultaneous equations involving one linear and one quadratic equation in two variables
- Solve cubic equations containing at least one rational root
Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Solutions Of Equations. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The line y = x + 2 meets the curve y = x^2 - 4. How many points of intersection are there? A) 0 B) 1 C) 2 D) 3 Answer: C
- If f(x) = x^3 - 2x^2 - 5x + 6, what is f(1)? A) 0 B) 2 C) -2 D) 6 Answer: A
- Which of these is NOT a valid first step when solving y = 3x + 1 and y = x^2 simultaneously? A) Set 3x + 1 = x^2 B) Substitute y = 3x + 1 into y = x^2 C) Multiply both equations together D) Rearrange to x^2 - 3x - 1 = 0 Answer: C
- The cubic x^3 + 6x^2 + 11x + 6 = 0 has a root at x = -1. What is the quadratic factor? A) x^2 + 5x + 6 B) x^2 + 7x + 6 C) x^2 - 5x + 6 D) x^2 + 5x - 6 Answer: A
- The line y = mx + c does not intersect the parabola y = x^2. What can be said about the discriminant of x^2 - mx - c = 0? A) It is positive B) It is zero C) It is negative D) It equals 4 Answer: C
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Practice Mock Questions
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