यदि \(x^2-9x+n=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha^2+\beta^2=45\), तो (n) का मान क्या है?

If \(\alpha,\beta\) are the roots of \(x^2-9x+n=0\) and \(\alpha^2+\beta^2=45\), what is the value of (n)?

Explanation opens after your attempt
Correct Answer

B. (18)

Step 1

Concept

Here \(\alpha+\beta=9\) and \(\alpha\beta=n\). From (81-2n=45), we get (n=18).

Step 2

Why this answer is correct

The correct answer is B. (18). Here \(\alpha+\beta=9\) and \(\alpha\beta=n\). From (81-2n=45), we get (n=18).

Step 3

Exam Tip

\(\alpha+\beta=9\) और \(\alpha\beta=n\) है। (81-2n=45) से (n=18) मिलता है।

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यदि \(x^2-9x+n=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha^2+\beta^2=45\), तो (n) का मान क्या है? / If \(\alpha,\beta\) are the roots of \(x^2-9x+n=0\) and \(\alpha^2+\beta^2=45\), what is the value of (n)?

Correct Answer: B. (18). Explanation: \(\alpha+\beta=9\) और \(\alpha\beta=n\) है। (81-2n=45) से (n=18) मिलता है। / Here \(\alpha+\beta=9\) and \(\alpha\beta=n\). From (81-2n=45), we get (n=18).

Which concept should I revise for this Mathematics MCQ?

Here \(\alpha+\beta=9\) and \(\alpha\beta=n\). From (81-2n=45), we get (n=18).

What exam hint can help solve this Mathematics question?

\(\alpha+\beta=9\) और \(\alpha\beta=n\) है। (81-2n=45) से (n=18) मिलता है।