# How do you write the product as a trinomial (2r - 5)(r + 10)?

$2 {r}^{2} + 15 r - 50$
$\left(2 r - 5\right) \left(r + 10\right) = 2 r \cdot r + 2 r \cdot 10 - 5 \cdot r - 5 \cdot 10 = 2 {r}^{2} + 20 r - 5 r - 50 = 2 {r}^{2} + 15 r - 50$