Algebraic Identities & Factorization MCQ & Objective Questions
Algebraic Identities and Factorization are crucial topics in mathematics that play a significant role in school and competitive exams. Mastering these concepts not only enhances your problem-solving skills but also boosts your confidence during exams. Practicing MCQs and objective questions on these topics helps you identify important questions and strengthens your exam preparation.
What You Will Practise Here
Fundamental Algebraic Identities (e.g., (a + b)², (a - b)²)
Factoring Polynomials using various methods (e.g., grouping, quadratic)
Applications of Algebraic Identities in simplifying expressions
Common Factor and Factorization Techniques
Identifying and solving Algebraic Equations
Word Problems involving Algebraic Identities
Real-life applications of Factorization in problem-solving
Exam Relevance
Algebraic Identities and Factorization are frequently tested in CBSE, State Boards, NEET, and JEE exams. Students often encounter questions that require them to apply these identities to simplify expressions or solve equations. Common question patterns include direct application of identities, factorization of polynomials, and solving word problems that involve algebraic concepts.
Common Mistakes Students Make
Confusing different algebraic identities, leading to incorrect applications.
Overlooking signs while factoring, which can change the outcome of the problem.
Neglecting to check their work after factorization, resulting in missed errors.
Rushing through problems without fully understanding the concepts involved.
FAQs
Question: What are some basic algebraic identities I should remember?Answer: Key identities include (a + b)² = a² + 2ab + b² and (a - b)² = a² - 2ab + b².
Question: How can I improve my factorization skills?Answer: Regular practice with various types of polynomials and understanding different factorization techniques will enhance your skills.
Start solving practice MCQs on Algebraic Identities and Factorization today to test your understanding and improve your performance in exams. Remember, consistent practice is the key to success!
Q. Factor the expression 4x² - 12x + 9.
A.
(2x - 3)²
B.
(2x + 3)(2x - 3)
C.
(4x - 3)(x - 3)
D.
(2x - 1)(2x - 9)
Show solution
Solution
4x² - 12x + 9 = (2x - 3)².
Correct Answer:
A
— (2x - 3)²
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Q. Factor the expression 4x² - 25.
A.
(2x - 5)(2x + 5)
B.
(4x - 5)(4x + 5)
C.
(2x + 5)(2x + 5)
D.
(2x - 5)(2x - 5)
Show solution
Solution
4x² - 25 = (2x - 5)(2x + 5) as it is a difference of squares.
Correct Answer:
A
— (2x - 5)(2x + 5)
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Q. Factor the expression x^2 + 10x + 25.
A.
(x + 5)(x + 5)
B.
(x + 10)(x + 15)
C.
(x + 5)(x - 5)
D.
(x + 25)(x + 1)
Show solution
Solution
This is a perfect square trinomial. It can be factored as (x + 5)(x + 5) or (x + 5)^2.
Correct Answer:
A
— (x + 5)(x + 5)
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Q. Factor the expression x^2 - 16.
A.
(x - 4)(x + 4)
B.
(x - 8)(x + 8)
C.
(x - 2)(x + 2)
D.
(x - 16)(x + 16)
Show solution
Solution
This is a difference of squares. It can be factored as (x - 4)(x + 4).
Correct Answer:
A
— (x - 4)(x + 4)
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Q. Factor the expression x^2 - 25.
A.
(x - 5)(x + 5)
B.
(x - 25)(x + 1)
C.
(x - 5)(x - 5)
D.
(x + 5)(x + 5)
Show solution
Solution
Using the difference of squares identity, x^2 - 25 = x^2 - 5^2 = (x - 5)(x + 5).
Correct Answer:
A
— (x - 5)(x + 5)
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Q. Factor the expression x² + 10x + 25.
A.
(x + 5)²
B.
(x + 10)(x + 5)
C.
(x + 5)(x - 5)
D.
(x + 2)(x + 3)
Show solution
Solution
x² + 10x + 25 = (x + 5)², a perfect square trinomial.
Correct Answer:
A
— (x + 5)²
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Q. Factor the expression x² + 5x + 6.
A.
(x + 2)(x + 3)
B.
(x - 2)(x - 3)
C.
(x + 1)(x + 6)
D.
(x - 1)(x - 6)
Show solution
Solution
x² + 5x + 6 = (x + 2)(x + 3) because 2 and 3 add to 5 and multiply to 6.
Correct Answer:
A
— (x + 2)(x + 3)
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Q. Factor the expression x² - 16.
A.
(x - 4)(x + 4)
B.
(x - 8)(x + 2)
C.
(x - 2)(x + 2)
D.
(x - 4)(x - 4)
Show solution
Solution
x² - 16 = (x - 4)(x + 4) because it is a difference of squares.
Correct Answer:
A
— (x - 4)(x + 4)
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Q. Factor the expression x² - 9.
A.
(x - 3)(x + 3)
B.
(x - 9)(x + 1)
C.
(x - 3)(x - 3)
D.
(x + 3)(x + 3)
Show solution
Solution
x² - 9 = (x - 3)(x + 3) using the difference of squares.
Correct Answer:
A
— (x - 3)(x + 3)
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Q. If a = 3, what is the value of (a + 2)²?
Show solution
Solution
(a + 2)² = (3 + 2)² = 5² = 25
Correct Answer:
A
— 25
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Q. If x = 3, what is the value of (x + 1)(x - 1)?
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Solution
(3 + 1)(3 - 1) = 4 * 2 = 8.
Correct Answer:
A
— 8
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Q. What is the expanded form of (2x - 5)(3x + 4)?
A.
6x² - 7x - 20
B.
6x² - 10x - 20
C.
6x² - 7x + 20
D.
6x² + 7x - 20
Show solution
Solution
(2x - 5)(3x + 4) = 6x² + 8x - 15x - 20 = 6x² - 7x - 20.
Correct Answer:
A
— 6x² - 7x - 20
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Q. What is the expanded form of (2x - 5)(x + 4)?
A.
2x² - 10x - 20
B.
2x² - 3x - 20
C.
2x² - 6x - 20
D.
2x² - 10x + 20
Show solution
Solution
2x(x) + 2x(4) - 5(x) - 5(4) = 2x² + 8x - 5x - 20 = 2x² - 10x - 20.
Correct Answer:
A
— 2x² - 10x - 20
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Q. What is the expanded form of (x + 1)(x + 1)?
A.
x² + 2x + 1
B.
x² + x + 1
C.
x² + 3x + 1
D.
x² - 2x + 1
Show solution
Solution
(x + 1)(x + 1) = x² + 2x + 1 (Perfect square)
Correct Answer:
A
— x² + 2x + 1
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Q. What is the expanded form of (x + 2)(x - 2)?
A.
x² - 4
B.
x² + 4
C.
x² - 2
D.
x² + 2
Show solution
Solution
(x + 2)(x - 2) = x² - 4 using the difference of squares.
Correct Answer:
A
— x² - 4
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Q. What is the expanded form of (x + 2)(x - 3)?
A.
x² - x - 6
B.
x² + x - 6
C.
x² - 6
D.
x² + 6
Show solution
Solution
(x + 2)(x - 3) = x² - 3x + 2x - 6 = x² - x - 6.
Correct Answer:
A
— x² - x - 6
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Q. What is the expanded form of (x + 5)(x - 5)?
A.
x² - 25
B.
x² + 25
C.
x² - 10
D.
x² + 10
Show solution
Solution
(x + 5)(x - 5) = x² - 25, which is a difference of squares.
Correct Answer:
A
— x² - 25
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Q. What is the expanded form of (x - 2)(x + 5)?
A.
x^2 + 3x - 10
B.
x^2 + 3x + 10
C.
x^2 - 3x - 10
D.
x^2 - 3x + 10
Show solution
Solution
Expanding using the distributive property: (x)(x) + (x)(5) + (-2)(x) + (-2)(5) = x^2 + 5x - 2x - 10 = x^2 + 3x - 10.
Correct Answer:
A
— x^2 + 3x - 10
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Q. What is the result of (2x + 5)(2x - 5)?
A.
4x² - 25
B.
4x² + 25
C.
4x² - 10x + 25
D.
4x² + 10x - 25
Show solution
Solution
(2x + 5)(2x - 5) = 4x² - 25 using the difference of squares formula.
Correct Answer:
A
— 4x² - 25
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Q. What is the result of (x + 4)^2?
A.
x^2 + 8x + 16
B.
x^2 + 16
C.
x^2 + 4x + 4
D.
x^2 + 4x + 16
Show solution
Solution
Using the square of a binomial identity, (a + b)^2 = a^2 + 2ab + b^2, we have (x + 4)^2 = x^2 + 2(4)x + 4^2 = x^2 + 8x + 16.
Correct Answer:
A
— x^2 + 8x + 16
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Q. What is the result of (x - 1)(x + 1) when x = 3?
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Solution
Substituting x = 3, we get (3 - 1)(3 + 1) = 2 * 4 = 8.
Correct Answer:
C
— 6
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Q. What is the result of (x - 4)(x + 4)?
A.
x² - 16
B.
x² + 16
C.
x² - 8
D.
x² + 8
Show solution
Solution
(x - 4)(x + 4) = x² - 16 using the difference of squares.
Correct Answer:
A
— x² - 16
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Q. What is the value of (2x + 3)(2x - 3) when x = 2?
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Solution
Substituting x = 2, we get (2*2 + 3)(2*2 - 3) = (4 + 3)(4 - 3) = 7 * 1 = 7.
Correct Answer:
C
— 9
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Q. What is the value of (3x + 2)(3x - 2) when x = 1?
Show solution
Solution
(3(1) + 2)(3(1) - 2) = (3 + 2)(3 - 2) = 5 * 1 = 5.
Correct Answer:
D
— 9
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Q. What is the value of (3x + 2)(3x - 2)?
A.
9x^2 - 4
B.
9x^2 + 4
C.
6x^2 - 4
D.
6x^2 + 4
Show solution
Solution
Using the difference of squares identity, (3x + 2)(3x - 2) = (3x)^2 - (2)^2 = 9x^2 - 4.
Correct Answer:
A
— 9x^2 - 4
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Q. What is the value of (3x + 2)²?
A.
9x² + 12x + 4
B.
9x² + 6x + 4
C.
6x² + 12x + 4
D.
3x² + 6x + 4
Show solution
Solution
(3x + 2)² = 9x² + 12x + 4.
Correct Answer:
A
— 9x² + 12x + 4
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Q. What is the value of (3x - 2)² when x = 1?
Show solution
Solution
(3x - 2)² = (3(1) - 2)² = (3 - 2)² = 1² = 1
Correct Answer:
B
— 4
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Q. What is the value of (3x - 4)²?
A.
9x² - 24x + 16
B.
9x² + 24x + 16
C.
9x² - 16
D.
9x² - 12x + 16
Show solution
Solution
(3x - 4)² = 9x² - 24x + 16 using the square of a binomial formula.
Correct Answer:
A
— 9x² - 24x + 16
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Q. What is the value of (a - 2)(a + 2)?
A.
a² - 4
B.
a² + 4
C.
a² - 2
D.
a² + 2
Show solution
Solution
(a - 2)(a + 2) = a² - 4, which is a difference of squares.
Correct Answer:
A
— a² - 4
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Q. What is the value of (x + 1)^2 - (x - 1)^2?
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Solution
Using the difference of squares identity, (a + b)^2 - (a - b)^2 = 4b, we have (x + 1)^2 - (x - 1)^2 = 4(1) = 4.
Correct Answer:
A
— 4
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