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Mark the Correct Alternative in Each of the Following: If X − 2 is a Factor of X2 + 3ax − 2a, Then a = - Mathematics

MCQ

Mark the correct alternative in each of the following:
If x − 2 is a factor of x2 + 3ax − 2a, then a =

Options

  • 2

  • -2

  • 1

  • -1

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Solution

As (x -2)is a factor of  `f(x) = x^2 +3ax - 2a`

i.e. f(2) = 0

`(2)^2 +3a (2) -2a = 0`

           `4 +6a -2a = 0`

                                ` = -1`

  Is there an error in this question or solution?
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APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 6 Factorisation of Polynomials
Q 1 | Page 34
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