How to solve this sum using this identity(x+a) (x+b) = x sqaure+(a+b)x +ab que is (x-9) (x+7) . negative and postive signs are con fusing
How to solve this sum using this identity
(x+a) (x+b) = x sqaure+(a+b)x +ab
que is (x-9) (x+7) . negative and postive signs are con fusing










