Question

Need help the input: 3 output:9 input:5 output:25 input:2 output: blank input:7 output:49 input:blank output:64 can you please find the rule.

Answer 1

3 -> 9
5 -> 25
2 -> ?
7 -> 49

if x is input and y is output, it sure looks like
y = x^2

Answer 2

Input: -3 Output: blank
Input: -2 Output: -4
Input: -1 Output: blank
Input: 0 Output: blank
Input: 1 Output: -1

Answer 3

It's difficult to determine the rule with just five examples, but it is possible that the rule is y = -x^2, where y is the output and x is the input.

Input: -3, Output: blank
Input: -2, Output: -4 (since (-2)^2 = 4, and then multiply by -1 for negative results)
Input: -1, Output: blank
Input: 0, Output: blank
Input: 1, Output: -1 (since 1^2 = 1, then multiply by -1 for negative results)