Question:
If x2 – x + 1 = 0, then what is x x x x x x 11 1 24 8 is equal to?
If x2 – x + 1 = 0, then what is x x x x x x 11 1 24 8 is equal to?
Options:
- a) 81
- b) 85
- c) 87
- d) 90
- a) 81
- b) 85
- c) 87
- d) 90
correct answer : c)
Explanation:
x2 – x + 1 = 0 Þ x = 13
2
± i
if x = 13
2
+ i
then
1
x
=
13
2
– i
Now x x- 1
= 3i
x x x x x x-
+-
+-
11 1248
= – 3 + 9 + 81 = 87
Solved Paper – 2025 (I)
x2 – x + 1 = 0 Þ x = 13
2
± i
if x = 13
2
+ i
then
1
x
=
13
2
– i
Now x x- 1
= 3i
x x x x x x-
+-
+-
11 1248
= – 3 + 9 + 81 = 87
Solved Paper – 2025 (I)