a 2 + 2ab + b2 – c2 type expressions
5. type expression
This is advance form of expression. We can say it is combination of 3 & 4 types above. First part involving a and b variables is a whole square. When it is written in whole square form – the whole expression converts to form.
We know that ;
In this expression we can see that first three terms can be taken as whole square of by using =
; Now use =(a+b)(a-b)