UPSC Prelims 2000·GS1·science-and-technology·science and technology

If X = -2, then X3 - X2 - X - 1 is equal to

Dalvoy logo
Reviewed by Dalvoy
UPSC Civil Services preparation
Last updated 23 May 2026, 3:31 pm IST
  1. A1
  2. B-3
  3. C-11Correct
  4. D-15

Explanation

To solve this, substitute the value of X with minus 2 in the given expression: X cubed minus X squared minus X minus 1. Step 1: Minus 2 cubed is minus 8. Step 2: Minus 2 squared is 4, so minus X squared becomes minus 4. Step 3: Minus X becomes minus of minus 2, which is plus 2. Step 4: The constant is minus 1. Combining these values: minus 8 minus 4 plus 2 minus 1. Minus 12 plus 2 minus 1 equals minus 10 minus 1, which equals minus 11. Therefore, the correct option is C.
science-and-technology: If X = -2, then X3 - X2 - X - 1 is equal to

Related questions

More UPSC Prelims practice from the same subject and topic.