Exactly what do you need to do with this? If you just need to simplify the expression, first let's expand (2x + 3)²
(2x + 3)² = 4x² + 12x + 9
Next, we can use the Distributive Property on the 3(x - 2) term
3(x - 2) = 3x - 6
Now, let's put it all together
4x² + 12x + 9 - (3x - 6)
= 4x² + 12x + 9 - 3x + 6
= 4x² + 9x + 15