Algebraic Identities MCQs
Practice Algebraic Identities multiple-choice questions from Polynomials (Class 9 Maths) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Algebraic IdentitiesQuiz - Solve & Score
Q1. 17^2 - 13^2 = ?
- A.120
- B.30
- C.4
- D.121
Answer: A. 120
We are told that 17, 2, 13, 2 (math, chapter 'Polynomials'). Our target: the unknown asked. The relevant chapter relation links the data to the unknown - rearrange it to isolate the quantity we are solving for. Substituting and simplifying: (17-13)(17+13) = 4×.30 = 120. That lands on option A) 120. As for the others, option B) '30' misses the point - Compute; option C) '4' misses the point - Multiply both.
Q2. 21^2 - 19^2 = ?
- A.80
- B.40
- C.2
- D.81
Answer: A. 80
Q3. Two numbers add up to 7 and their product is 10. Using the square-of-a-sum identity, find the value of the sum of their squares.
- A.29
- B.49
- C.69
- D.39
Answer: A. 29
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