Respuesta :

You multiply everything from 1st prentacis to the 2nd, like so...
x×3x=3x^2
x×5=5x
then...
-2×3x=-6x
-2×5=-10
Add it all up and simplafy .....

3x^2+5x-6x-10=

3x^2 - x -10 is the final answer