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gugha priya

· started a discussion

· 1 Months ago

Plz help (Question: 246545.0 )

Requesting you to tell me how a(cube)=1

Question:
If a2 + a + 1 = 0 then, find the value of a5 + a4 + 1.
Options:
A) 3
B) 5
C) 0
D) 2
Solution:

Ans: (c)


Knowledge Expert

· commented

· 1 Months ago

Dear Student,
When we got a + 1/a= -1
Then cube both the sides and you will get, a3 + 1/a3 = 1,
From here it can be seen it is possible when a3=1.
Hope you understood the solution.

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