If A={x:x2−5x+6=0}A = \{x : x^2 - 5x + 6 = 0\}A={x:x2−5x+6=0} and B={x:x2−9=0}B = \{x : x^2 - 9 = 0\}B={x:x2−9=0}, what is AΔBA \Delta BAΔB?
{2,3}\{2, 3\}{2,3}
{2,3,−3,3}\{2, 3, -3, 3\}{2,3,−3,3}
{2,−3}\{2, -3\}{2,−3}
{2,−3,3}\{2, -3, 3\}{2,−3,3}