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Which of the following is the factor of x2 - 3x -18?1. (x + 9)2. (x - 6)3. (x - 2)4. (x - 3) |
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Answer» Correct Answer - Option 2 : (x - 6) Given: Factor of x2 -3x -18 =? Concept used: To find the factor of an algebraic expression, put the equation value as zero Detailed solution: x2 - 3x -18 = 0 ⇒ x2 - 6x + 3x - 18 = 0 ⇒ x(x - 6) + 3(x - 6) = 0 ⇒ ( x + 3)(x - 6) = 0 ∴ The factor of the expression x2 - 3x -18 is x - 6 and x + 3 |
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