(-5) (2a+3b)

To simplify the expression \((-5) (2a + 3b)\), you can use the distributive property, which says that \(a(b + c) = ab + ac\).

Applying this to your expression:

\[ (-5)(2a) + (-5)(3b) \]

Calculating each term:

\[ -10a - 15b \]

So, the simplified expression is:

\[ -10a - 15b \]