" (iii) "30z^(2)+7z-15

Simplify combining like terms: -z^(2) +13z^(2) - 5z + 7z^(3) -15z

If z= -3 + sqrt2i , then prove that z^(4) + 5z^(3) + 8z^(2) + 7z + 4 is equal to -29

Subtract : 3z^(2)-2z^(2)+7z -8 from 8-z-z^(2)

If z=1+2i , show that z^(2)-2z+5=0 . Hence find the value of z^(3) +7z^(2)-z+16 .

If z=1+2i , show that z^(2)-2z+5=0 . Hence find the value of z^(3) +7z^(2)-z+16 .

If z = 3- 5i then z^(2) - 10z + 30=

If z = 3 + 3i then, z^(2)+z+15 =

Evaluate : (iv) (2-z) (15-z)

If z_(1) = 3, z_(2) = -7i, and z_(3) = 5 + 4i, show that z_(1)(z_(2) + z_(3)) = z_(1) z_(2) + z_(1) z_(3)