Question

a chart on algebraic identities for class 9

Answer 1

a+b)2 = a2 + b2 + 2ab

(a-b)2 = a2 + b2 - 2ab

​a2 - b2 = (a+b)(a-b)

​(a+b)3 = a3 + b3 + 3a2b + 3ab​2

(a-b)3 = a3 - b3 -3a2b + 3ab2

a3 + b3 = (a+b)(a2 + b2 -ab)

a3 - b3 = (a-b)(a2 + b2 + ab)

(a + b + c)2 =  a2+ b2 + c2 + 2ab + 2bc + 2ac

these are the most commonly used identities.
 

Answer 2

Answer

Step-by-step explanation:

most common identities that i know are

(a+b)2-= a2+2ab+b2

(a-b)2= a2-2ab+b2

(a2-b2)= (a-b) (a+b)