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

-2i is a zero of f(x) = x^4 - 45x^2 - 196

2i, 14i, -14i

2i, 7, -7

2i, 14, -14

2i, 7i, -7i

Question

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

-2i is a zero of f(x) = x^4 - 45x^2 - 196

2i, 14i, -14i

2i, 7, -7

2i, 14, -14

2i, 7i, -7i

amistre64 · Answer

might want to just plug and chug the options to see what fits

anonymous · Answer

i forgot how to use imaginary numbers, im on a semester review, and this was from near the beginning of the year

anonymous · Answer

u ave 2 subsitute the value -21 in x, then  simplfy

anonymous · Answer

the value is 2(i) not 21.

anonymous · Answer

sory my bad, then did u subsitute that in the equation

anonymous · Answer

16i -90i^2 - 196

anonymous · Answer

now what do i do?

amistre64 · Answer

since -2i is a given root, its conjugate pair 2i is a root, which is given in all the options.

try x=7 and x=14 to see if they zero it out

amistre64 · Answer

or you can run the quadraitic formula if need be