5x² + 5x + 2x + 2
5x(x + 1) + 2(x + 1)
(5x + 2)(x + 1)
Answer:

Step-by-step explanation:
The given function is;

This is the same as;

Add and subtract the square of half the coefficient of x.

Observe that the first three terms is a perfect square trinomial.

The vertex form is 
The vertex (8,-64)
You multiply the price by 1.06 to get the total cost with tax. That amount is $212
Answer:
C
Step-by-step explanation:
3x^2+5x^2-2x+6x+4-8
8x^2+4x-4