Question

a² - b² - (a + b)^2​

Answer 1

Answer:

${a}^{2} - {b}^{2} - ( {a}^{2} + {b}^{2} + 2ab) \\ {a}^{2} - {b}^{2} - {a }^{2} - {b}^{2} - 2ab \\ - 2 {b}^{2} - 2ab$

Answer 2

Answer:

-2b(b+a)

if

$a {}^{2} + b {}^{2} - (a - b) {}^{2} = 0$

then

a=b