Question

Which of the following can you say about the roots of $x^2–2x–3=0$?

• A. both of them are natural numbers
• B. both of them are integers
• C. one of the root is zero.
• D. roots are not real

Answer 1

The correct option is B

both of them are integers

Step 1:- For $x^2–2x–3=0$, value of discriminant
D = $(-2{)}^2–4(-3\left)\right(1)=4+12=16$.

Step 2:- Since, D is a perfect square, roots are rational and unequal.

Step 3:- Solving the equation,
$x=\left[-(-2)+\sqrt{(}16\left)\right]/2or\right[-(-2)-\sqrt{(}16)]/2$
$x=3,-1$
Thus, both of them are integers.