The Factor And Remainder Theorems
Bayani Gaba-gaba
How can you tell whether a linear expression divides exactly into a polynomial without carrying out the full long division? The factor theorem and the remainder theorem give you a direct shortcut: substitute a single value, and the answer tells you everything you need. These two results are the key tools for breaking cubic and higher-degree polynomials into simpler factors.
In this topic you will learn to test whether a given linear expression is a factor, find the remainder from any linear divisor, and combine these techniques with algebraic division to factorise cubics completely. These skills appear frequently on both papers of the Edexcel 4PM1 exam and connect directly to solving polynomial equations.
Manufura
- Know that if f(x) = 0 when x = a, then (x - a) is a factor of f(x)
- Factorise cubic expressions when a factor has been provided
- Determine the remainder when the polynomial f(x) is divided by (ax + b) or (ax - b)
Takardar Darasi
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- If f(x) = x^3 - 3x^2 + 2x - 6 and f(3) = 0, which of the following is a factor of f(x)? A) (x + 3) B) (x - 3) C) (x - 6) D) (x + 1) Answer: B
- When f(x) = x^3 + x^2 - 2x + 1 is divided by (x - 1), the remainder is: A) 0 B) 1 C) -1 D) 3 Answer: B
- Which value of x should you substitute to test whether (x + 4) is a factor of f(x)? A) x = 4 B) x = -4 C) x = 1/4 D) x = -1/4 Answer: B
- The polynomial f(x) = 2x^3 - x^2 + kx + 6 has (x - 2) as a factor. What is k? A) -5 B) -7 C) 5 D) 7 Answer: A
- If the remainder when f(x) is divided by (x - a) is equal to zero, then: A) a is a coefficient of f(x) B) (x - a) is a factor of f(x) C) f(x) has degree a D) f(x) has no real roots Answer: B
Akwai a cikin manhajar Green Bridge
Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.
Akwai a cikin manhajar Green Bridge
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