Question

1-2ab-(a^2+b^2) please solve the Q

Answer 1

answer is -(a+b)^2+1

Answer 2

$1 - 2ab - (a {}^{2} + b {}^{2} ) \\ = 1 - (2ab + a {}^{2} + b {}^{2} ) \\ = 1 - (a + b) {}^{2} =(1) {}^{2} - (a + b) {}^{2} \\ = (1 + a + b)(1 - a - b)$