What are the zeros of the polynomial function: f(x) = (x – 3)(x + 1)(x + 5)?

and

If f(x) = 2x2 – 4x + 5 and g(x) = 2x – 2, what is f(x) + g(x) ?

Question

What are the zeros of the polynomial function: f(x) = (x – 3)(x + 1)(x + 5)? 

and 

If f(x) = 2x2 – 4x + 5 and g(x) = 2x – 2, what is f(x) + g(x) ?

parthkohli · Answer

You see three factors, right?

anonymous · Answer

yup

parthkohli · Answer

You may evaluate each zero from looking at the factors.
If $k$ is a zero, then $x - k$ is a factor.

parthkohli · Answer

So, in $x - 3$, $k$ looks like 3 right?

parthkohli · Answer

Just do the same for all the others. 
Careful if you have a positive sign.
If you have $x + k$, then you may express it as $x + (-k)$ so then -k will be a zero.