Question 235935
{{{(5x-4y)(x+3y)}}} Start with the given expression



{{{(5x)(x)+(5x)(3y)+(-4y)(x)+(-4y)(3y)}}} FOIL



{{{5x^2+15xy-4xy-12y^2}}} Multiply



{{{5x^2+11xy-12y^2}}} Combine like terms.



So {{{(5x-4y)(x+3y)=5x^2+11xy-12y^2}}}