Solutions Of Equations
Muhtasari
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.
Malengo
- Solve simultaneous equations involving one linear and one quadratic equation in two variables
- Solve cubic equations containing at least one rational root
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- 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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