Complex Numbers and Quadratic Equations

Express each of the complex number given in the Exercises 1 to 10 in the
form a + ib.
4. 3(7 + i7) + i (7 + i7) 5. (1 – i) – ( –1 + i6)
6.
1 2 5 4
5 5 2
i i         + − +     7.
1 7 1 4 4
3 3 3 3
i i i
      
      + + + − − +  
      
8. (1 – i)
4 9.
3
1
3
3
i
    +
  10.
3
1
2
3
i
    − −  