I need to know the answer for this

Can any one me with the answers to these questions asap?

Factor x2 – 8x + 15. which pair of numbers has a product of ac and a sum of what is the factored form of the

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?