Question

How do you find all the zeros of `f(x)= x^2-2x-4`?

Answer 1

`-1.236 or 3.236`

Explanation:

Use the quadratic formula to find points where `f(x)=0`.

This occurs when `x=(-(-2)+-sqrt(2^2-4(1)(-4)))/((2)(1))`

`=(2+-sqrt20)/2`

`=-1.236 or 3.236`.

We may verify this by plotting the graph of the function :

graph{x^2-2x-4 [-10, 10, -4.996, 5.005]}