1. Multiply \((x – 4)\) and \((2x + 3)\)
 
2. Multiply \((x – y)\) and \((3x + 5y)\)
Answer variants:
\(3x^2+5y^2+2xy\)
\(2x^2-5x+12\)
\(2x^2-5x-12\)
\(3x^2-5y^2+2xy\)