Concept-wise Practice

double-plus-square MCQ Questions for Class 9

double-plus-square se related questions ko ek jagah revise karein. Har question me bilingual content, answer feedback aur explanation available hai.

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2 questions tagged with double-plus-square.

Question 1/2 Hard Mathematics Sequences and Progressions Recursive rule Class 9 Level 47

यदि \(a_1=5\) और \(a_{n+1}=2a_n+n^2\) है तो \(a_4\) क्या होगा?

If \(a_1=5\) and \(a_{n+1}=2a_n+n^2\), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. (61)

Step 1

Concept

The terms are (5,11,26,61), so \(a_4=61\). Exam tip: double first and then add \(n^2\).

Step 2

Why this answer is correct

The correct answer is C. (61). The terms are (5,11,26,61), so \(a_4=61\). Exam tip: double first and then add \(n^2\).

Step 3

Exam Tip

पद (5,11,26,61) हैं इसलिए \(a_4=61\) है। पहले दोगुना करें फिर \(n^2\) जोड़ें।

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Question 2/2 Hard Mathematics Sequences and Progressions Recursive rule Class 9 Level 46

यदि \(a_1=1\) और \(a_{n+1}=2a_n+n^2\) है तो \(a_4\) क्या होगा?

If \(a_1=1\) and \(a_{n+1}=2a_n+n^2\), what is \(a_4\)?

Explanation opens after your attempt
Correct Answer

C. (29)

Step 1

Concept

The terms are (1,3,10,29), so \(a_4=29\). Exam tip: double first and then add \(n^2\).

Step 2

Why this answer is correct

The correct answer is C. (29). The terms are (1,3,10,29), so \(a_4=29\). Exam tip: double first and then add \(n^2\).

Step 3

Exam Tip

पद (1,3,10,29) हैं इसलिए \(a_4=29\) है। पहले दोगुना करें फिर \(n^2\) जोड़ें।

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