Question

anyone else know this sum ​

Answer 1

Step-by-step explanation:

yes it's a identity

first multiply x with 2nd bracket and then add a multiplied by 2nd bracket . so

x (x+b) +a (x+b)

x^2 + xb + xa or ax + ab

now take x as common from xb and xa

= x^2 + (a+b)x + ab