Question

How do you find all the zeros of `F(x)=x^2-25`?

Answer 1

The zeroes (or 'roots') of a function occur when it crosses the x-axis, the line `y=0`. Let `x^2-25=0`. Rearranging `x^2=25 to x=+-sqrt25=+-5`. The roots are `+5` and `-5`.