Two consecutive numbers whose squares differ by 25

Ineed asap.i cant understand this question i need someone to me right away

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Can some one explain this i got sent this. is this a threat i’m scared