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NDA 2012
Exam
NDA
Year
2012
Subject
Mathematics
Chapter
Quadratic Equation

NDA 2012 · Mathematics · Quadratic Equation

If one of the roots of the equation x^2+a x-b=0 is 1 , then what is...

If one of the roots of the equation x2+ax−b=0x^2+a x-b=0 is 1 , then what is (a−b)(a-b) equal to?

Options

  1. A-1
  2. B1
  3. C2
  4. D-2

Correct answer

A. -1

Step-by-step solution

(1)2+a(1)−b=0a−b=−1\begin{aligned} & (1)^2+a(1)-b=0 \\ & a-b=-1\end{aligned}
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