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NDA 2011
Exam
NDA
Year
2011
Subject
Mathematics
Chapter
Quadratic Equation

NDA 2011 · Mathematics · Quadratic Equation

If 3 is the root of the equation x^2-8 x+k=0 , then what is the...

If 3 is the root of the equation x2−8x+k=0x^2-8 x+k=0, then what is the value of kk ?

Options

  1. A-15
  2. B9
  3. C15
  4. D24

Correct answer

C. 15

Step-by-step solution

Since 3 is root of the equation ∴32−8×3+k=0⇒k=15.\begin{array}{rlrl} \therefore & 3^2-8 \times 3+k & =0 \\ \Rightarrow & & k & =15. \end{array}
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