Lakshya Education MCQs

Question:  (a - b)² =
Options:
A.a² + b²
B.a² - b²
C.a² + 2ab + b²
D.a² - 2ab + b²
Answer: Option D
Explanation :

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More Questions on This Topic :

Question 1.  expand and simplify (x + y)³
  1.    x³ - y³
  2.    x³ + y³
  3.    x³ + 3xy(x - y) + y³
  4.    x³ + 3xy(x + y) + y³
Answer: Option D
Explanation :
Question 2.  simplify (x - 9)(x + 10) ⁄ (x² - 81)
  1.    (x + 10) ⁄ (x - 9)
  2.    (x + 10) ⁄ (x + 9)
  3.    (x² + x - 90) ⁄ (x² - 81)
  4.    None of above
Answer: Option B
Explanation :
Question 3.  expand and simplify (x + y)³
  1.    x³ - y³
  2.    x³ + y³
  3.    x³ + 3xy(x - y) + y³
  4.    x³ + 3xy(x + y) + y³
Answer: Option D
Explanation :
Question 4.  factorise -20x² - 9x + 20
  1.    (5 - 4x)(4 - 5x)
  2.    (5 - 4x)(4 + 5x)
  3.    (5 + 4x)(4 - 5x)
  4.    (5 + 4x)(4 + 5x)
Answer: Option C
Explanation :
Question 5.  simplify (x - 9)(x + 10) ⁄ (x² - 81)
  1.    (x + 10) ⁄ (x - 9)
  2.    (x + 10) ⁄ (x + 9)
  3.    (x² + x - 90) ⁄ (x² - 81)
  4.    None of above
Answer: Option B
Explanation :
Question 6.  simplify 5⁄2 ÷ 1⁄x
  1.    2x ⁄ 5
  2.    5x ⁄ 2
  3.    5 ⁄ 2x
  4.    2 ⁄ 5x
Answer: Option B
Explanation :

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