Question 1022169
{{{(7x^2-4xy+8y^2+5x-3y)-(5x^2-4y^2+6y-3)=(7(2)^2-4(2)(3)+8(3)^2+5(2)-3(3))-(5(2)^2-4(3)^2+6(3)-3)}}}
{{{(7x^2-4xy+8y^2+5x-3y)-(5x^2-4y^2+6y-3)=(7(4)-24+8(9)+10-9)-(5(4)-4(9)+18-3)}}}
Now finish it.