Question

Find all other zeros: http://prntscr.com/47m431

Answer 1

\(\normalsize\color{blue}{ f(x)= x^4-45x^2-196 }\) to solve for zero, set the function equal to zero,

\(\normalsize\color{blue}{ x^4-45x^2-196=0 }\) THEN, \(\normalsize\color{blue}{ \rm{let~~~x^2=a} }\)

The rest is easy.

Answer 2

Let me know if you need farther assistance.

Answer 3

Ok. Should I then use synthetic division?

Answer 4

No, just substitute \(\normalsize\color{blue}{ a }\) for \(\normalsize\color{blue}{ x^2 }\) and re-write the equation, (you should get a quadratic).

Answer 5

Yes, then factor?

Answer 6

Yes

Answer 7

Yes

Answer 8

Thanks

Answer 9

I prefer you to post your answer when you are done though, to verify it.