First, change the subtraction symbol to the addition symbol: (5*y *+ 3*x*)(8*y *+ -1) All together: 40*y*^{2} + 24*xy* + -5*y* + -3*x* There are no like terms to combine, so we are done. | **FOIL**
First: 5*y *× 8*y *= 40*y*^{2} Outer: 5*y*(-1) = -5*y* Inner: 3*x *× 8*y *= 24*xy* Last: 3*x*(-1) = -3*x* All together: 40*y*^{2} + 24*xy* + -5*y* + -3*x* Again, no like terms, so we are done! |