Question

What is a square +b square?

Answer 1

The answer is.....

a^2 + b^2 = ( a - b ) ( a + b )

Answer 2

$we \: know \: that \\ {(a + b)}^{2} = {a}^{2} + {b}^{2} + 2ab \\ {(a + b)}^{2} - 2ab= {a}^{2} + {b}^{2} \\ hence \\ {a}^{2} + {b}^{2} = {(a + b)}^{2} - 2ab$