Answer :
Let's see
[tex]\\ \sf\longmapsto 25x^2-4=0[/tex]
[tex]\\ \sf\longmapsto 25x^2=4[/tex]
[tex]\\ \sf\longmapsto (5x)^2=2^2[/tex]
[tex]\\ \sf\longmapsto 5x=2[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{2}{5}[/tex]
- Smallest zero 2/5
Let's see
[tex]\\ \sf\longmapsto 25x^2-4=0[/tex]
[tex]\\ \sf\longmapsto 25x^2=4[/tex]
[tex]\\ \sf\longmapsto (5x)^2=2^2[/tex]
[tex]\\ \sf\longmapsto 5x=2[/tex]
[tex]\\ \sf\longmapsto x=\dfrac{2}{5}[/tex]