Simplify the following expression.

First, arrange the like terms as shown.

Now add the terms +3x^{2} and +5x^{2} together. You will get 8x^{2}.

Now add the like terms +5x and -2x together. You will get 3x.

There is no more like terms in this expression. This expression cannot be simplified further.

The final expression is 3x +8x2 +7. You can rearrange the expression as 8x2 +3x +7 so it looks neater. Therefore, the answer is B.

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