Respuesta :

To simplify the expression, we need to use an exponent propertie

[tex]a^n\cdot a^m=a^{n+m}[/tex]

Then, we can see that in this case a = x, n = 4 and m = -7

So now we must replace the values

[tex]x^4\cdot x^{-7}=x^{4-7}=x^{-3}[/tex]