2x2-3y2 = (√2x+√3y) (√2x-√3y)1-36b2 = (1+6b)(1-6b)0.49p2-144= (0.7p+12)(0.7p-12)(2x+y)2-(x+2y)2 = (2x+y+x+2y)(2x+y-x-2y) = (3x+3y)(x-y) = 3(x+y)(x-y)