Expert Mathematics Quadratic Equations Class 10 Level 28

एक आयत की लंबाई (2x+1) और चौड़ाई (x-4) है। यदि क्षेत्रफल (45) है, तो सही द्विघात समीकरण कौन-सा है?

A rectangle has length (2x+1) and breadth (x-4). If the area is (45), which quadratic equation is correct?

Explanation opens after your attempt
Correct Answer

A. \(2x^2-7x-49=0\)

Step 1

Concept

The area is ((2x+1)(x-4)=45). Expanding gives \(2x^2-7x-4=45\), so \(2x^2-7x-49=0\).

Step 2

Why this answer is correct

The correct answer is A. \(2x^2-7x-49=0\). The area is ((2x+1)(x-4)=45). Expanding gives \(2x^2-7x-4=45\), so \(2x^2-7x-49=0\).

Step 3

Exam Tip

क्षेत्रफल ((2x+1)(x-4)=45) होगा। विस्तार करने पर \(2x^2-7x-4=45\), इसलिए \(2x^2-7x-49=0\)।

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एक आयत की लंबाई (2x+1) और चौड़ाई (x-4) है। यदि क्षेत्रफल (45) है, तो सही द्विघात समीकरण कौन-सा है? / A rectangle has length (2x+1) and breadth (x-4). If the area is (45), which quadratic equation is correct?

Correct Answer: A. \(2x^2-7x-49=0\). Explanation: क्षेत्रफल ((2x+1)(x-4)=45) होगा। विस्तार करने पर \(2x^2-7x-4=45\), इसलिए \(2x^2-7x-49=0\)। / The area is ((2x+1)(x-4)=45). Expanding gives \(2x^2-7x-4=45\), so \(2x^2-7x-49=0\).

Which concept should I revise for this Mathematics MCQ?

The area is ((2x+1)(x-4)=45). Expanding gives \(2x^2-7x-4=45\), so \(2x^2-7x-49=0\).

What exam hint can help solve this Mathematics question?

क्षेत्रफल ((2x+1)(x-4)=45) होगा। विस्तार करने पर \(2x^2-7x-4=45\), इसलिए \(2x^2-7x-49=0\)।

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