Question

How to know which algebraic identities should we apply in many sums

Answer 1

Answer:

See there format

Step-by-step explanation:

Example

(2a+3b)2 is of the form (a+b)2 = a2+2ab+b2

so the answer of the question will be

(2a+3b)2=(2a)2 +2(2a)(3b)+(3b)2

             = 4a2+12ab+9b2