Question

simplify a [a^2 + 1] + b [b^2 + 1] - [a + b]​

Answer 1

$a( {a}^{2} + 1) + b( {b}^{2} + 1) - (a + b) \\ = {a}^{3} + a + {b}^{3} + b - a - b \\ = {a}^{3} + {b}^{3}$