Hello, in your own words, what is a radical expression?

What is the smallest integer n such that n\sqrt{2} is greater than 20

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?

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?