Ответ:\((x+5)(x-1)=x^2-x+5x-5=x^2+4x-5\);\((a+2)(a+6)=a^2+6a+2a+12=a^2+8a+12\);\((3m-2)(m+5)=3m^2+15m-2m-10=3m^2+13m-10\);\((2y+3)(y-4)=2y^2-8y+3y-12=2y^2-5y-12\);\((4x-1)(2x+3)=8x^2+12x-2x-3=8x^2+10x-3\).