Find the value of the expression when $x=9$x=9:

$6x+4$6x+4

Find the value of the expression when $x=3$x=3:

$3x^2-7x-4$3x2−7x−4

Find the value of the expression when $x=-3$x=−3:

$-3x^3+4x^2+7x+5$−3x3+4x2+7x+5

Find the value of the expression when $x=8$x=8:

$\frac{x+6}{x+5}$x+6x+5

Manipulate rational, exponential, and logarithmic algebraic expressions

Apply algebraic methods in solving problems