Find a cubic function with the given zeros.

Question

anonymous · Answer

$$\sqrt{5},-\sqrt{5}, -7$$

 f(x) = x3 - 7x2 - 5x - 35

 f(x) = x3 + 7 x2 - 5x + 35

 f(x) = x3 + 7x2 - 5x - 35

 f(x) = x3 + 7x2 + 5x - 35

anonymous · Answer

If you really have no idea what to do the least you can do is try plugging them in to every function and see which one is true

cwrw238 · Answer

Hint:  the  last number is formed by √5 *−√5 * -7
- whats the value of this?

anonymous · Answer

Factor-Root theorem: if k is a root (a 'zero'), then (x-k) is a factor of the polynomial.

anonymous · Answer

+35 sp the answer would be B

anonymous · Answer

Something doesn't look right about that.

anonymous · Answer

You don't multiply the roots together, you multiply the factors.
If √5 is  root, then (x-√5) is a factor, etc.

anonymous · Answer

@cwrw238 I think you forgot to switch the signs.

cwrw238 · Answer

aaah yes - u r right   silly me