For this case we must evaluate the following expression:
[tex]\frac {1} {x ^ {- 2}}\ for\ x = 7[/tex]
By definition of power properties we have to:
[tex]x ^ {- 1} = \frac {1} {x ^ 1} = \frac {1} {x}[/tex]
So, rewriting the given expression we have:
[tex]\frac {1} {\frac {1} {x ^ 2}}[/tex]
Applying double c we have:
[tex]\frac {1} {\frac {1} {x ^ 2}} = x ^ 2[/tex]
Substituting [tex]x = 7[/tex]we have:
[tex]7 ^ 2 = 49[/tex]
Thus, the value of the expression for[tex]x = 7[/tex]is 49
Answer:
49
