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Coordinate Geometry

Question

The expanded form of $open parentheses straight x plus 1 third close parentheses cubed$ is
$straight x cubed plus 1 over 27 plus straight x over 3 plus straight x squared$
$straight x cubed plus 1 over 9 plus straight x over 3 plus straight x squared$
$straight x cubed plus 1 over 27 plus straight x squared over 3 plus straight x$
$straight x cubed plus 1 over 27 plus 3 straight x plus 3 straight x squared$

Solution

straight x cubed plus 1 over 27 plus straight x over 3 plus straight x squared