An expression is shown below:
f(x) = -16x^2 + 22x + 3
Part A ~ What are the x-interecpts of the graph f(x)? Show your work.
Part B ~ Is the vertex of the graph f(x) going to be a maximum or a minimum? what are the coordinates of the vertex? Justify your answer and show your work.
Part C ~ What are the steps you would use to graph f(x)? Make sure you can answer the obtained in Part A and Part B to draw the graph.

It's an essay question, so you're not really making a graph. It would be if you had to draw it.

Question

An expression is shown below:
f(x) = -16x^2 + 22x + 3
Part A ~ What are the x-interecpts of the graph f(x)? Show your work.
Part B ~ Is the vertex of the graph f(x) going to be a maximum or a minimum? what are the coordinates of the vertex? Justify your answer and show your work. 
Part C ~ What are the steps you would use to graph f(x)? Make sure you can answer the obtained in Part A and Part B to draw the graph. 

It's an essay question, so you're not really making a graph. It would be if you had to draw it.

solomonzelman · Answer

part A.

f(x) = -16x^2 + 22x + 3
0 = -16x^2 + 22x + 3

can you solve this quadratic equation ?

anonymous · Answer

No, i'm not sure how to solve quadric equations. It's my unit 4, which is the next unit i'm going to be working on.

solomonzelman · Answer

multiply the equation times -1, you get...

16x^2 - 22x - 3 = 0

use the quadratic formula.

anonymous · Answer

So you'd get... 
-16x^2  + 22 + 3 =0
Right?

solomonzelman · Answer

I got that when I set y (or "f(x)" - same thing) equal zero.

I multiplied everything times  -1  and now, can you solve for x using a quadratic formula ?

anonymous · Answer

Do I just add square 16, subtract 22 and 3 and divide them? I don't know what a quadric formula is. I haven't learned anything about it yet.

solomonzelman · Answer

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