Factoring problems

Question

How do I get the equation to solve this problem. For the square of a number is fifty more than twice the square of the number that's five less

Answer 1

n² = 50 + 2(n - 5)²

n² = 50 + 2(n² - 10n + 25) = 50 + 2n² - 20n + 50

n² - 20n + 100 = (n -10)² => n = 10

Answer 2

For the square of a number is fifty more than twice the square of the number that's five less

n^2 = 50 + 2(n-5)^2