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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