3 ms·
(a^2 - b^2) = -(b^2 - a^2) use the same visual proof but with a and b switched to get -(b + a)(b - a) = (a + b)(a - b)
by Ma8ee 2y ago
(a^2 - b^2) = -(b^2 - a^2)
use the same visual proof but with a and b switched to get
-(b + a)(b - a) = (a + b)(a - b)