Question

What is a square+b square+c square

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Answer 1

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

The actual formula is

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

You can get this simple formula by multiplying (a+b +c) with (a+b+c).

(a+b +c)² = (a+b +c)*(a+b +c)

= a*(a+b +c) + b*(a+b +c) + c*(a+b +c)

= a² + ab + ac + ab + b² + bc + ca + bc + c²

= a² + b² + c² + 2ab + 2bc + 2ca

= a² + b² + c² + 2( ab + bc + ca)

hope it helps mate   ╰(*°▽°*)╯

Answer 2

The actual formula is. (a+b+c)² = a² + b² + c² +2( ab + bc + ca)