Translating

The sum of a number and five

• x + 5

• x - 5

• 5x

The difference of two and a number

•  $x\ -\ 2$  

•  $2\ -\ x$  

The product of two and a number plus eight

• 2x

• 2+8x

• 2x+8

A number squared plus nine

• $x+9$

• $x^2+9$

• $2x+9$

A number cubed minus the product of three and the same number.

• $3x-3x$

• $x^3-3x$

Six less than a number

• x - 6

• 6 - x

Nine decreased by a number squared

• $x^2-9$

• $9-x^2$

Eight more than a number

• 8x

• x + 8

The total of eight and a number cubed

• $8x^3$

• $8\ +\ x^3$

three times a number subtracted by four

• 3x - 4

• 4 - 3x