Q. 11

  1. x^2 + x - 12 \Rightarrow (x + 4)(x - 3)

  2. 25x^2 - 4y^2 \Rightarrow 5^2x^2 - 2^2y^2 \Rightarrow (5x - 2y)^2 \Rightarrow (5x + 2y)(5x - 2y)