Question

2a(a-b)+7a(a+b)=
which identity will be used in this ques ​

Answer 1

Answer:

2a(a-b)+7a(a+b)

= -2a(a+b)+7a(a+b)

Since a+b is common in both terms ,

= (-2a + 7a) ( a + b )

= 5a( a+b )

Hope it helps :)