Question 1081603
Use the FOIL method,
F-First,
{{{2x(3x)=6x^2}}}
O-Outer,
{{{2x(5)=10x}}}
I-Inner
{{{-4(3x)=-12x}}}
L-Last
{{{-4(5)=-20}}}
So,
{{{(2x-4)(3x+5)=6x^2+10x-12x-20}}}
{{{(2x-4)(3x+5)=6x^2-2x-20}}}