Question:medium

Assertion (A): Zeroes of a polynomial \(p(x) = x^2 − 2x − 3\) are -1 and 3.
Reason (R): The graph of polynomial \(p(x) = x^2 − 2x − 3\) intersects the x-axis at (-1, 0) and (3, 0).

Updated On: Feb 6, 2026
  • Both, Assertion (A) and Reason (R) are true. Reason (R) explains Assertion (A) completely.
  • Both, Assertion (A) and Reason (R) are true. Reason (R) does not explain Assertion (A).
  • Assertion (A) is true but Reason (R) is false.
  • Assertion (A) is false but Reason (R) is true.
Show Solution

The Correct Option is A

Solution and Explanation

Step 1: Verification of Assertion (A):

Given the polynomial \( p(x) = x^2 - 2x - 3 \). To find its zeroes, we solve \( x^2 - 2x - 3 = 0 \). Factoring the quadratic expression requires finding two numbers that multiply to \( -3 \) and add to \( -2 \). These numbers are \( -3 \) and \( 1 \), as \( (-3) \times 1 = -3 \) and \( (-3) + 1 = -2 \). Thus, the factored form is \( (x - 3)(x + 1) = 0 \). Setting each factor to zero yields the roots: \( x - 3 = 0 \Rightarrow x = 3 \) and \( x + 1 = 0 \Rightarrow x = -1 \). The zeroes of the polynomial are \( x = 3 \) and \( x = -1 \), confirming the assertion that the zeroes are \( -1 \) and \( 3 \).

Step 2: Verification of Reason (R):

The graph of a quadratic polynomial intersects the x-axis at points where the polynomial's value is zero. These points are the x-intercepts, which correspond to the zeroes of the polynomial. As established in Step 1, the zeroes of \( p(x) = x^2 - 2x - 3 \) are \( x = -1 \) and \( x = 3 \). Therefore, the graph of this polynomial intersects the x-axis at \( (-1, 0) \) and \( (3, 0) \). This validates the reason that the graph intersects the x-axis at these specific points.

Step 3: Conclusion:

Both the assertion and the reason are factually correct.
- The assertion is true because the zeroes of \( p(x) = x^2 - 2x - 3 \) were correctly calculated as \( -1 \) and \( 3 \).
- The reason is also true, as the graph of the polynomial intersects the x-axis at the points corresponding to its zeroes.
Consequently, the appropriate conclusion is:
Both, Assertion (A) and Reason (R) are true. Reason (R) provides a complete explanation for Assertion (A).
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