Question Details

If x = 11 , then the value of ( x5 12x4 + 12x3 12x2 + 12x 1 ) is:

Options

A

14

B

9

C

8

D

10

Show Answer

Correct Answer :

Option D

10

Solution :

The given question asks for the value of the algebraic expression:
x5 12x4 + 12x3 12x2 + 12x 1
when x = 11 .

To evaluate this expression efficiently without calculating large powers of 11 directly, we can write the coefficients of the terms in relation to x .
Since x = 11 , we can express the number 12 as:
12 = x + 1

Now, substitute 12 = x + 1 into the expression:
x5 (x+1)x4 + (x+1)x3 (x+1)x2 + (x+1)x 1

Next, expand each term inside the expression:
= x5 (x5+x4) + (x4+x3) (x3+x2) + (x2+x) 1

Remove the parentheses:
= x5 x5 x4 + x4 + x3 x3 x2 + x2 + x 1

Notice that most of the terms cancel out:
- x5 x5 = 0
- x4 + x4 = 0
- x3 x3 = 0
- x2 + x2 = 0

After cancellation, the entire expression simplifies to:
x 1

Finally, substitute the value of x = 11 :
11 1 = 10

Therefore, the correct answer is 10.

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