If `z = 4 + isqrt7` then the value of `Z^3-4Z^2-9z+ 91` equal

If z=4+isqrt(7) , then find the value of z^2-4z^2-9z+91.

If z=4+isqrt(7) , then find the value of z^2-4z^2-9z+91.

If z=4+i sqrt(7), then find the value of z^(2)-4z^(2)-9z+91

If (x,y,z) is the solution of the equations 4x + y = 7 3y + 4z = 5 5x + 3z = 2 Then the value of x + y + z equals

If |z_1|=1, |z_2| = 2, |z_3|=3 and |9z_1 z_2 + 4z_1 z_3+ z_2 z_3|=12 , then the value of |z_1 + z_2+ z_3| is equal to

let z_1,z_2,z_3 and z_4 be the roots of the equation z^4 + z^3 +2=0 , then the value of prod_(r=1)^(4) (2z_r+1) is equal to :

let z_1,z_2,z_3 and z_4 be the roots of the equation z^4 + z^3 +2=0 , then the value of prod_(r=1)^(4) (2z_r+1) is equal to :

If z= 2- isqrt(3) then |z^(4)| is equal to