यदि \(U={x:x \in \mathbb{Z},-8\le x\le 8}\) और \(A={x:x \in U,x^2-2x-15\le 0}\), तो (A') में कितने सदस्य हैं?

If \(U={x:x \in \mathbb{Z},-8\le x\le 8}\) and \(A={x:x \in U,x^2-2x-15\le 0}\), how many elements are in (A')?

Explanation opens after your attempt
Correct Answer

A. (7)

Step 1

Concept

The inequality \(x^2-2x-15\le 0\) gives \(-3\le x\le 5\), so (A) has (9) integers. Since (U) has (17) elements, the complement has (17-9=8) elements.

Step 2

Why this answer is correct

The correct answer is A. (7). The inequality \(x^2-2x-15\le 0\) gives \(-3\le x\le 5\), so (A) has (9) integers. Since (U) has (17) elements, the complement has (17-9=8) elements.

Step 3

Exam Tip

\(x^2-2x-15\le 0\) से \(-3\le x\le 5\) मिलता है, इसलिए (A) में (9) पूर्णांक हैं। (U) में (17) सदस्य हैं, पर यहां पूरक (8) नहीं बल्कि (-8) से (-4) और (6) से (8) मिलाकर (8) होना चाहिए।

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Mathematics Answer, Explanation and Revision Hints

यदि \(U={x:x \in \mathbb{Z},-8\le x\le 8}\) और \(A={x:x \in U,x^2-2x-15\le 0}\), तो (A') में कितने सदस्य हैं? / If \(U={x:x \in \mathbb{Z},-8\le x\le 8}\) and \(A={x:x \in U,x^2-2x-15\le 0}\), how many elements are in (A')?

Correct Answer: A. (7). Explanation: \(x^2-2x-15\le 0\) से \(-3\le x\le 5\) मिलता है, इसलिए (A) में (9) पूर्णांक हैं। (U) में (17) सदस्य हैं, पर यहां पूरक (8) नहीं बल्कि (-8) से (-4) और (6) से (8) मिलाकर (8) होना चाहिए। / The inequality \(x^2-2x-15\le 0\) gives \(-3\le x\le 5\), so (A) has (9) integers. Since (U) has (17) elements, the complement has (17-9=8) elements.

Which concept should I revise for this Mathematics MCQ?

The inequality \(x^2-2x-15\le 0\) gives \(-3\le x\le 5\), so (A) has (9) integers. Since (U) has (17) elements, the complement has (17-9=8) elements.

What exam hint can help solve this Mathematics question?

\(x^2-2x-15\le 0\) से \(-3\le x\le 5\) मिलता है, इसलिए (A) में (9) पूर्णांक हैं। (U) में (17) सदस्य हैं, पर यहां पूरक (8) नहीं बल्कि (-8) से (-4) और (6) से (8) मिलाकर (8) होना चाहिए।