Use the product rule to find the derivative of (2x^2 + 3)(3x + 5).
Let the factors be called
u(x) = 2x^2 + 3,
and v(x) = 3x + 5).
The product rules says that
d/dx (u*v) = u*(dv/dx) + v*(du/dx)
You do the rest. Surely you can compute dv/dx and du/dx.