add the polynomials for the following: (4x²+5x+6) +(3x²+9x)

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When adding polynomials, you must make sure you only combine terms with the same degree.

Add:  `(4x^2 + 5x+6) + (3x^2 + 9x)`

First rearrange to place like terms together.

`(4x^2 + 3x^2) + (5x + 9x) + 6`

This will give:

`7x^2 + 14x + 6`

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