Question

what does red and blue circle mean explain in detail please​

Answer 1

Explanation:

The red circle indicate that both are same particular thing which can be represented in two ways.. u can represent it in either of the form that is with modulus like in the LHS or else without modulus symbol like in the RHS

The blue circle is nothing but the cross multiplication of the above expression which you have enclosed it with a box symbol

Hope so it was helpful