Answer:
49
Step-by-step explanation:
we have
[tex]\frac{1}{x^{-2}}[/tex]
Remember the property of exponents
[tex]\frac{1}{a^{-n}}=a^n[/tex]
so
[tex]\frac{1}{x^{-2}}=x^2[/tex]
For x=7
substitute the value of x in the expression above
[tex]7^2=49[/tex]
