Respuesta :

[tex]2b^{-2}3b^{-2}[/tex]

Using the following property:

[tex]x^y\cdot x^z=x^{y+z}[/tex]

Therefore:

[tex]2b^{-2}3b^{-2}=3\times2(b^{-2+(-2)})=6b^{-4}[/tex]