[tex]\\ \sf\longmapsto \left(\dfrac{3}{4}\right)^2\times \left(\dfrac{1}{4}\right)^{-2}[/tex]
[tex]\\ \sf\longmapsto \dfrac{3^2}{4^2}\times 4^2[/tex]
[tex]\\ \sf\longmapsto 3^2[/tex]
[tex]\\ \sf\longmapsto 9[/tex]
