Lakshya Education MCQs

Question:  factorise -20x² - 9x + 20
Options:
A.(5 - 4x)(4 - 5x)
B.(5 - 4x)(4 + 5x)
C.(5 + 4x)(4 - 5x)
D.(5 + 4x)(4 + 5x)
Answer: Option C
Explanation :

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More Questions on This Topic :

Question 1.  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 2.  factorise x² + x - 72
  1.    (x + 8)(x - 9)
  2.    (x - 8)(x + 9)
  3.    (x - ?72)²
  4.    (x - ?72)(x + ?72)
Answer: Option B
Explanation :
Question 3.  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 4.  (a - b)² =
  1.    a² + b²
  2.    a² - b²
  3.    a² + 2ab + b²
  4.    a² - 2ab + b²
Answer: Option D
Explanation :
Question 5.  factorise x² + x - 72
  1.    (x + 8)(x - 9)
  2.    (x - 8)(x + 9)
  3.    (x - ?72)²
  4.    (x - ?72)(x + ?72)
Answer: Option B
Explanation :
Question 6.  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 :

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