To what expression must 99x³ – 33x² – 13x – 41 be added to make the sum zero?

Given expression:

99x³ – 33x² – 13x – 41

Negative of the above expression is

-99x³ + 33x² + 13x + 41

(99x³ – 33x² – 13x – 41) + (-99x³ + 33x² + 13x + 41)

= 99x³ – 33x² – 13x – 41 – 99x³ + 33x² + 13x + 41

= 0

Hence, the required expression is -99x³ + 33x² + 13x + 41