[tex]a)\\2x+3xy+5=2*2+3*2*(-3)+5=4+6*(-3)+5=4-18+5=-9\\b)\\2x+x^{2} +3x=2*(-5)+(-5)^{2} +3*(-5)=-10+25-15=0\\c)\\-x+xy-2(x-y)=-(-1)+(-1)*(-2)-2(-1-(-2)=1+2-2=1[/tex]
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[tex]a)\\2x+3xy+5=2*2+3*2*(-3)+5=4+6*(-3)+5=4-18+5=-9\\b)\\2x+x^{2} +3x=2*(-5)+(-5)^{2} +3*(-5)=-10+25-15=0\\c)\\-x+xy-2(x-y)=-(-1)+(-1)*(-2)-2(-1-(-2)=1+2-2=1[/tex]