Simplify the polynomial expression given below.

(2x - 1) (2x2 + 5x + 3) + (3x + 6)

The first step is as follows:

2x (2x2 + 5x + 3) - 1 (2x2 + 5x + 3) + (3x + 6)

A. 4x³ + 8x² + 4x + 3

B. 4x³ + 8x² + 14x + 9

C. 2x² + 24x + 6

Can anyone solve this? 5x^2-3+3=0 also is it a quadratic equation?

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