The product of a monomial and binomial is . (monomial/binomial/trinomial)

Solve: $3(5x-7)-2(9x-11)=4(8x-13)-17$.

If the sum of $5+x-x^2-x^3, 3x-5+2x^2-x^3$ and $x+5+2x^3-5x^2$ is of the form $a{x}^3+b{x}^2+cx+d$, then find the value of $\left(a+b+c+d\right)$.

Subtract  $8-6x+x^2-7x^3+x^5$ from $x^4-6x^3+x^2-3x+1$.

If the expansion of $(\sqrt{3}x-2y{)}^2$ is $a{x}^2-b\sqrt{3}xy+c{y}^2$, then find the value of $a+b+c$.

Find the value of $49x^2+36y^2+84xy$ when $x=3, y=6$.