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## Answers

This formula is not correct

(a+b)^2 = a^2 +b^2+ 2ab &

(a +b+ c)^2 =a^2 + b^2 + c^2 +2(ab+bc+ca)

(a+b)^2 = a^2 +b^2+ 2ab &

(a +b+ c)^2 =a^2 + b^2 + c^2 +2(ab+bc+ca)

__The above identity(given by u ) is not correct.(Since in the L.H.S c is not present whereas in the R.H.S side it is present.)__

__The real identities are__

__(a+b)²=a²+2ab+b² and__

______(a+b+c)²=a²+b²+c²+2(ab+bc+ca)__

Suppose there is a square of area aSuppose there is a square of area a

**²m²**

________**

**And Let each side be increased by b m.**

**New area= Sum of areas of the 4 rectangles so formed**

**=m²((a*a)+(a*b)+(a*b)+(b*b))**

**=m²(a²+ab+ab+b²)**__HENCE VERIFIED.__

**=m²(a²+2ab + b²)**