How was the question 7+7+7 = 21 and 3×7 = 21 related ?

What properties allow transformation to be used as a problem solving tool

Which polynomial equation of least degree has -2, -2, 3, and 3 as four of its roots? (x + 2)(x - 3) = 0 (x - 2)-2(x + 3)3 = 0 (x-2 + 2)(x2- 3) = 0 (x + 2)2(x - 3)2 = 0

What line represents the relationship between r and s