## Geometry: Common Core (15th Edition)

$A=10x^2+3.5xy-3y^2\ units^2$
Use the formula for the area of a triangle $A=\frac{1}{2}bh$ $A=\frac{1}{2}(5x-2y)(4x+3y)$ Use the FOIL method to multiply the binomials: $A=\frac{1}{2}(20x^2+15xy-8xy-6y^2)$ $A=\frac{1}{2}(20x^2+7xy-6y^2)$ Use the distributive property: $A=10x^2+3.5xy-3y^2$