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Use the Remainder Theorem to Find Which of the Following is a Factor of 2x3 + 3x2 – 5x – 6. X + 2 - Mathematics

Sum

Use the Remainder Theorem to find which of the following is a factor of 2x3 + 3x2 – 5x – 6. 

x + 2

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Solution

By remainder theorem we know that when a polynomial f (x) is divided by x – a, then the remainder is f(a).
Let f(x) = 2x3 + 3x2 – 5x – 6 

`f(-2)=2(-2)^3(-2)^2-5(-2)-6`

=-16+12+10-6=0` 

Thus, (x + 2) is a factor of the polynomial f(x).

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APPEARS IN

Selina Concise Maths Class 10 ICSE
Chapter 8 Remainder and Factor Theorems
Exercise 8 (A) | Q 3.3 | Page 108
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