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

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