Question

i) a- b2 = (a + b)(a - b) pura khol ka kisi ko ata ha please mujha batadena​

Answer 1

a−b)(a2+ab+b2)=a3−b3

Formula:

(x−y)(x2+xy+y2)=x3−y3

Answer 2

An expression such as ` (a+b)(a−b) ‘ is not a problem so doesn’t have a solution. You can however pose a problem/question such as `How can I expand this?’ or `What is this when I expand the brackets?’.

It is also important to clarify what mathematical context you are working in. For example, if a,b are numbers they commute and then (a+b)(a−b)=a2−b2 , but if they are square matrices then they may not commute so (a+b)(a−b)=a2−ab+ba−b2 is the best you can say without further information.

Another thing to note is that for some purposes (a+b)(a−b) may be the best form for the expression, for example you might be interested in knowing when this is zero given you know a , so you need to be aware of the real goal of what you are doing