Zyreeldviz Zyreeldviz Math Answered 5. If a? - b = (a + b)(a - b) then x2 - 9 = (x+3)(x-3) b. ( x + 2 )( x - 2 )c. ( x + 1 )( x - 1 ) d. x ( x + 3 ) a. ( x + 3 )(x - 3 )