Question

Using the given zero, find all other zeros of f(x).

Answer 1

Hello : 
answer : a 
 because : f(2i) = (2i)^4 -45(2i)² -196 = 16(1)-45(-4)-196...... ( i²=-1) 
                          = 16+180 -196 =196-196 =0
same solution : f(14i)=f(-14i)=0