Please help explain how to factor this problem: Xsquare - 81Ysquare
L locampo New member Joined Feb 2, 2006 Messages 1 Feb 2, 2006 #1 Please help explain how to factor this problem: Xsquare - 81Ysquare
U Unco Senior Member Joined Jul 21, 2005 Messages 1,134 Feb 2, 2006 #2 x^2 - 81y^2 is a difference of two squares: a^2 - b^2 = (a + b)(a - b).
