Cube Roots of Unity

IMPORTANT

Cube Roots of Unity: Overview

This topic covers concepts such as cube roots of unity, properties of cube root of unity, etc.

Important Questions on Cube Roots of Unity

HARD
IMPORTANT

Let   ω be a complex cube root of unity with   ω1.  A fair die is thrown three times.   r 1 , r 2 and r 3  are the numbers obtained on the die, then the probability that   ω r 1 + ω r 2 + ω r 3 =0 is

EASY
IMPORTANT

 For the equation  3x2+px+3=0, p>0 , if one of the root is square of the other, then p is –

HARD
IMPORTANT

Let   S=| a+bω+c ω 2 |, where a, b and c are not all equal integers and   ω  is an imaginary cube root of unity. Then minimum value of S is 

EASY
IMPORTANT

If  ω is an imaginary cube root of unity and  (1+ω)7=A+Bω, then real numbers A and B are respectively ­–

MEDIUM
IMPORTANT

If α and β are the distinct roots of equation x2-x+1=0, then what is the value of α100+β100α100-β100?

MEDIUM
IMPORTANT

If ω is a non-real cube root of 1, then what is the value of 1-ωω+ω2?

MEDIUM
IMPORTANT

Let α, β, γ be the three  roots of the equation x3+bx+c=0 if βγ=1=-α then b3+2c3-3α3-6β3-8γ3 is equal to 

HARD
IMPORTANT

Find the area of the triangle formed by roots of cubic equation z+αb3=α3α0.

MEDIUM
IMPORTANT

If ω is imaginary cube root of unity, then value of r=0541+ωr+ω2r equals to

MEDIUM
IMPORTANT

If 1,ω,ω2 are the cube roots of unity, n and n>2 then the least value of n such that 1+ω is a root of xn-x=0 is

MEDIUM
IMPORTANT

Let a be a root of the equation 1+x2+x4 = 0. Then the value of a1011+a2022a3033 is equal to:

MEDIUM
IMPORTANT

The area of triangle whose vertices are z, ωz, z+ωz is (where ω is complex cube root of unity)

EASY
IMPORTANT

If ω is the cube root of unity, then 1ωω2ωω21ω21ω=?

EASY
IMPORTANT

If ω is a cube root of unity, then the value of polynomial x+1ωω2ωx+ω21ω21x+ω is

HARD
IMPORTANT

If ω=e-2πi3,a,b,c,x,y,z are non-zero complex numbers such that a+b+c=x,a+bω+cω2=y and a+bω2+cω=z, then x2+y2+z2a2+b2+c2=

MEDIUM
IMPORTANT

Let ω be a cube root of 1, which is different from 1 Then the value of 1+ω20212021 is

MEDIUM
IMPORTANT

If x=a+b+c, y=aα+bβ+c, z = aβ+bα+c where α, β are complex cube roots of unity and a,b,c are real, then xyz is equal to

EASY
IMPORTANT

If the cube roots of unity are 1, ω, ω2, then the roots of the equation x+13+8=0 are

MEDIUM
IMPORTANT

The value of -1+i32-100+-1-i32100 is

EASY
IMPORTANT

If ω is the cube root of unity, then the value of 1-ω1-ω21-ω41-ω8 is