# Algebra: Quadratic Equation Problems

Solve the following:

1) Using the quadratic equation x2 - 6x + 8 = 0, perform the following tasks:

a) Solve by factoring.

b) Solve by using the quadratic formula.

2) For the function y = x2 - 6x + 8, perform the following tasks:

a) Put the function in the form y = a(x - h)2 + k.

b) What is the equation for the line of symmetry for the graph of this function?

c) Graph the function using the equation in part a. Explain why it is not necessary to plot points to graph when using y = a (x - h) 2 + k.

Show graph here.

Explanation of graphing.

d) In your own words, describe how this graph compares to the graph of y = x2?

3) Suppose a baseball is shot up from the ground straight up with an initial velocity of 32 feet per second. A function can be created by expressing distance above the ground, s, as a function of time, t. This function is s = -16t2 + v0t + s0

- 16 represents 1/2 g, the gravitational pull due to gravity (measured in feet per second 2).

- v0 is the initial velocity (how hard do you throw the object, measured in feet per second).

- 0 is the initial distance above ground (in feet). If you are standing on the ground, then s0 = 0.

a) What is the function that describes this problem?

b) The ball will be how high above the ground after 1 second?

c) How long will it take to hit the ground?

d) What is the maximum height of the ball?

4) Amanda has 400 feet of lumber to frame a rectangular patio (the perimeter of a rectangle is 2 times length plus 2 times width). She wants to maximize the area of her patio (area of a rectangle is length times width). What should the dimensions of the patio be, and show how the maximum area of the patio is calculated from the algebraic equation. Use the vertex form to find the maximum area.

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