Question

(5n-3)^2-(5n+2)(5n-2)=-47.

Answer 1

25n^2 -30n+ 9 - 25n^2 + 4 = -47

-30n +13 = -47

-30n = -13 - 47

30n = 60

n=2

Answer 2

$(5n-3)^{2}-(5n+2)(5n-2)=-47\ (25n^{2}-30n+9)-(25n^{2}-4)=-47\ 25n^{2}-30n+9-25n^{2}+4=-47\ -30n+13=-47\ 30n=47+13 n=frac{47+13}{30}=frac{60}{30}=2$