Quiz on polynomial simplification

Simplify the equation: $$\frac{x^2+x-6}{x-2}$$  

Simplify the equation: $$\frac{x^2+6x+8}{x+4}$$  

What is the roots of the following equation: $$y=x^2-8x-20$$  

What is the roots of the following equation: $$y=x^2+6x+5$$  

What is the value of f(x)= $$\frac{x^2+x}{x+1}$$  when x=2

Simplify the equation: $$\frac{\sqrt{x}-4}{x-16}$$  

Fill in the blank to complete the square: $$4x^2-ax+9\ \ =\ \left(2x-3\right)^2$$  

Fractor the following equation:

$$x^2-4x-12$$  

Use quadratic fomular to solve for the roots of this equation:

$$3x^2+9x+5$$  

give your answer rounded up to the hundred decimal places, separate by comma.   

(a)  

What do you know about limit? Describe what you know about it.