Question

Evaluate 1/x^-2 for x =7
0-49
1/49
49​

Answer 1

49

Explanation:

we have

`(1)/(x^(-2))`

Remember the property of exponents

`(1)/(a^(-n))=a^n`

so

`(1)/(x^(-2))=x^2`

For x=7

substitute the value of x in the expression above

`7^2=49`