Concept-wise Practice

algebraic-expression MCQ Questions for Class 10

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

Practice Questions

9 questions tagged with algebraic-expression.

यदि \(\alpha,\beta\), \(x^2-9x+20\) के शून्यक हैं, तो (\(\alpha+2\)\(\beta+2\)) का मान क्या है?

If \(\alpha,\beta\) are zeroes of \(x^2-9x+20\), what is the value of (\(\alpha+2\)\(\beta+2\))?

Explanation opens after your attempt
Correct Answer

A. (42)

Step 1

Concept

\(\alpha+\beta=9\) and \(\alpha\beta=20\). (\(\alpha+2\)\(\beta+2\)=\alpha\beta+2\(\alpha+\beta\)+4=20+18+4=42).

Step 2

Why this answer is correct

The correct answer is A. (42). \(\alpha+\beta=9\) and \(\alpha\beta=20\). (\(\alpha+2\)\(\beta+2\)=\alpha\beta+2\(\alpha+\beta\)+4=20+18+4=42).

Step 3

Exam Tip

\(\alpha+\beta=9\) और \(\alpha\beta=20\) हैं। (\(\alpha+2\)\(\beta+2\)=\alpha\beta+2\(\alpha+\beta\)+4=20+18+4=42)।

Open Question Page
Ask Friends

(\left\(\frac{x^{-2}y^{3}}{x^{4}y^{-1}}\right\)^{-1}) का सरल रूप क्या है?

What is the simplified form of (\left\(\frac{x^{-2}y^{3}}{x^{4}y^{-1}}\right\)^{-1})?

Explanation opens after your attempt
Correct Answer

A. \(x^{6}y^{-4}\)

Step 1

Concept

Inside, \(\frac{x^{-2}y^{3}}{x^{4}y^{-1}}=x^{-6}y^{4}\), and raising to (-1) gives \(x^{6}y^{-4}\). In exams, subtract exponents during division.

Step 2

Why this answer is correct

The correct answer is A. \(x^{6}y^{-4}\). Inside, \(\frac{x^{-2}y^{3}}{x^{4}y^{-1}}=x^{-6}y^{4}\), and raising to (-1) gives \(x^{6}y^{-4}\). In exams, subtract exponents during division.

Step 3

Exam Tip

अंदर \(\frac{x^{-2}y^{3}}{x^{4}y^{-1}}=x^{-6}y^{4}\), और (-1) घात लेने पर \(x^{6}y^{-4}\) मिलता है। परीक्षा में भाग में घात घटती है।

Open Question Page
Ask Friends

((xy)4) का सही विस्तार कौन सा है?

Which is the correct expansion of ((xy)4)?

Explanation opens after your attempt
Correct Answer

A. \(x^4y^4\)

Step 1

Concept

The power of a product applies to each factor, so ((xy)4=x-4y-4). Rules for sums and products are different.

Step 2

Why this answer is correct

The correct answer is A. \(x^4y^4\). The power of a product applies to each factor, so ((xy)4=x-4y-4). Rules for sums and products are different.

Step 3

Exam Tip

गुणनफल की घात हर गुणक पर लगती है इसलिए ((xy)4=x-4y-4)। योग और गुणनफल के नियम अलग होते हैं।

Open Question Page
Ask Friends

यदि \(\alpha=4+\sqrt{15}\) और \(\beta=4-\sqrt{15}\), तो \(\alpha+\beta+\alpha\beta\) क्या है?

If \(\alpha=4+\sqrt{15}\) and \(\beta=4-\sqrt{15}\), what is \(\alpha+\beta+\alpha\beta\)?

Explanation opens after your attempt
Correct Answer

A. (9)

Step 1

Concept

\(\alpha+\beta=8\) and \(\alpha\beta=16-15=1\), so the total is (9). In exams find the sum and product separately.

Step 2

Why this answer is correct

The correct answer is A. (9). \(\alpha+\beta=8\) and \(\alpha\beta=16-15=1\), so the total is (9). In exams find the sum and product separately.

Step 3

Exam Tip

\(\alpha+\beta=8\) और \(\alpha\beta=16-15=1\), इसलिए कुल (9) है। परीक्षा में योग और गुणनफल अलग-अलग निकालें।

Open Question Page
Ask Friends

यदि \(x=\sqrt{5}+\sqrt{2}\), तो (\(x^2-7\)2) का मान क्या है?

If \(x=\sqrt{5}+\sqrt{2}\), what is the value of (\(x^2-7\)2)?

Explanation opens after your attempt
Correct Answer

A. (40)

Step 1

Concept

\(x^2=5+2+2\sqrt{10}=7+2\sqrt{10}\).

Step 2

Why this answer is correct

Thus \(x^2-7=2\sqrt{10}\), and its square is (40).

Step 3

Exam Tip

First isolate the irrational part, then square it. चरण 1: \(x^2=5+2+2\sqrt{10}=7+2\sqrt{10}\)। चरण 2: इसलिए \(x^2-7=2\sqrt{10}\), और इसका वर्ग (40) है। चरण 3: पहले परिमेय भाग अलग करें, फिर वर्ग करें।

Open Question Page
Ask Friends

यदि \(x=1+\sqrt{2}\), तो \(x^2-2x\) का मान क्या है?

If \(x=1+\sqrt{2}\), what is the value of \(x^2-2x\)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

(x-2-2x=x(x-2)).

Step 2

Why this answer is correct

With \(x=1+\sqrt{2}\), \(x-2=\sqrt{2}-1\), so the product (\(1+\sqrt{2}\)\(\sqrt{2}-1\)=1).

Step 3

Exam Tip

Recognizing conjugate-like forms makes calculation shorter. चरण 1: (x-2-2x=x(x-2)) है। चरण 2: \(x=1+\sqrt{2}\) रखने पर \(x-2=\sqrt{2}-1\), इसलिए गुणन (\(1+\sqrt{2}\)\(\sqrt{2}-1\)=1) मिलता है। चरण 3: संयुग्मी जैसे रूपों को पहचानने से गणना छोटी होती है।

Open Question Page
Ask Friends

यदि \(x=\sqrt{7}\), तो \(x^2+4x\) किसके बराबर है?

If \(x=\sqrt{7}\), what is \(x^2+4x\) equal to?

Explanation opens after your attempt
Correct Answer

A. \(7+4\sqrt{7}\)

Step 1

Concept

(x-2=\(\sqrt{7}\)2=7).

Step 2

Why this answer is correct

\(4x=4\sqrt{7}\), so \(x^2+4x=7+4\sqrt{7}\).

Step 3

Exam Tip

Simplify the square and the multiplication separately. चरण 1: (x-2=\(\sqrt{7}\)2=7)। चरण 2: \(4x=4\sqrt{7}\), इसलिए \(x^2+4x=7+4\sqrt{7}\)। चरण 3: वर्ग और गुणा को अलग-अलग सरल करें।

Open Question Page
Ask Friends

यदि \(x=\sqrt{5}\), तो \(x^2+3x\) किसके बराबर है?

If \(x=\sqrt{5}\), what is \(x^2+3x\) equal to?

Explanation opens after your attempt
Correct Answer

A. \(5+3\sqrt{5}\)

Step 1

Concept

(x-2=\(\sqrt{5}\)2=5).

Step 2

Why this answer is correct

\(3x=3\sqrt{5}\), so \(x^2+3x=5+3\sqrt{5}\).

Step 3

Exam Tip

Simplify the square and the multiplication separately. चरण 1: (x-2=\(\sqrt{5}\)2=5)। चरण 2: \(3x=3\sqrt{5}\), इसलिए \(x^2+3x=5+3\sqrt{5}\)। चरण 3: वर्ग और गुणा को अलग-अलग सरल करें।

Open Question Page
Ask Friends

यदि \(x=\sqrt{3}\), तो \(x^2+2x\) किसके बराबर है?

If \(x=\sqrt{3}\), what is \(x^2+2x\) equal to?

Explanation opens after your attempt
Correct Answer

A. \(3+2\sqrt{3}\)

Step 1

Concept

(x-2=\(\sqrt{3}\)2=3).

Step 2

Why this answer is correct

\(2x=2\sqrt{3}\), so \(x^2+2x=3+2\sqrt{3}\).

Step 3

Exam Tip

Simplify the square and the product separately. चरण 1: (x-2=\(\sqrt{3}\)2=3)। चरण 2: \(2x=2\sqrt{3}\), इसलिए \(x^2+2x=3+2\sqrt{3}\)। चरण 3: वर्ग और गुणा को अलग-अलग सरल करें।

Open Question Page
Ask Friends