Question

Would the vertex of the quadratic equation y=4x^2+8x+1 be (-1,9)?

Answer 1

Use -b/(2a) to find it.

Answer 2

Well, yeah, I did that is my answer right? When I did that I got x= -1

Answer 3

-1 is correct.
Now insert -1 in the equation to get the value for y.

Answer 4

I did but I feel like I got the y part wrong

Answer 5

You are correct.
you should get -3.
which is correct.

So, this is NOT the vertex.

Answer 6

Would it be 3?

Answer 7

I mean -3 and thanks!

Answer 8

Correct.

Answer 9

What would the x intercepts be?

Answer 10

When x-intercept, y = 0
y=4x^2+8x+1
0=4x^2 + 8x + 1

Answer 11

then the next step is to subtract 1 from both sides right?

Answer 12

Nope,
factor or use the quadratic formula.

Answer 13

oh.

Answer 14

So (2x ) (2x )

Answer 15

yes..

Answer 16

but what when multiplied is 1 and when added is 8

Answer 17

I can't think of anything

Answer 18

4x^2 + 8x + 1
4x^2 + 4x + 4x + 1

Answer 19

why did you do that?

Answer 20

OH I remember!!

Answer 21

ok, cool. ;D

Answer 22

Alright let me try this one :p Um. I rmember what you do kins but not the exact steps

Answer 23

I skippped thorugh this unit and now im paying the price lol. I am a straight A student I just kinda was lazy with note taking, hw, ect and I dont really remember

Answer 24

lol.

Answer 25

4x^2 + 8x + 1

a= 4
b= 8
c = 1

a*c = 4
b = 8

Now we need two terms to which when we multiply we get 4 and when we add we get 8.

Answer 26

wait. i just found out this cannot be factorized. lol @StealerGirly50

Answer 27

okay I cant think of anything. To get four while multiplying you can have 1 and 4 which adds to 5, 2 and 2 which adds to 4

Answer 28

i have taught people from flvs. it's easyyy

Answer 29

we will use Quadratic formula now.

Answer 30

okay whats the formula?
I am so mad at myself! ugh! School is so freaking easy and I screwed up just for one unit now I have to relearn everything :/

Answer 31

Here it is,
http://2.bp.blogspot.com/_9xX2yNGJA4E/TPm214sFVjI/AAAAAAAAADI/nVLP-mPhYCM/s1600/QuadraticFormula.JPG

i helped a girl she failed her algebra 3 times! D:
I helped her and she passed. ;D

Answer 32

I tutored people in algebra before beleive it or not. I catch on quick in school but now that i tried online second semester you can kinda skip through everything cause the quzzes are super easy so i kinda slacked lol

Answer 33

that's cool.
haha @slacked.

Answer 34

-8+ square root of 8^2-4(4)(1)
_______________________________
2(4)

Answer 35

-8 + square root of 64-16
_______________________________
8

Answer 36

-8 + sqr root of 48
______________________
8

Answer 37

there is no even sqr root of 48 though....

Answer 38

use calc. you will get value in decimals.

Answer 39

okay let me find it real quick

Answer 40

Sure.

Answer 41

-8 +6.928203230275509
_____________________________
8

Answer 42

you should get,
-1.87, -0.13

Answer 43

I didnt lol

Answer 44

what did I do wrong

Answer 45

?

Answer 46

i just checked, you are doing correctly..
must have inserted wrong values in calc.

Answer 47

oh yay your calculator must of rounded cause I got -.1339745962155614

Answer 48

lol, i rounded by myself.

Answer 49

so what do I do after I get the -.13

Answer 50

that's the answer.

Answer 51

how did you figue -1.87?

Answer 52

*figure

Answer 53

umm, we had two equations.

Answer 54

solve another 1.

Answer 55

oh duh sorry im tired lol. ok I got it yayy

Answer 56

Lol, congrats.

Answer 57

I had one more question: Part 1: Solve each of the quadratic equations below. Show your work. (3 points)

x2 − 25 = 0 and x2 = 2x + 15

Part 2: Describe what the solution(s) represent to the graph of each. (2 points)

Part 3: How are the graphs alike? How are they different? (2 points) (7 points)

I solved everything except part 2

Answer 58

How do I do part 2

Answer 59

Use the dicriminant, b^2-4ac to find out.

Answer 60

HOw does that describe what the solutions represent to the graph?

Answer 61

is it's less than zero = imaginary solutions
if it's zero = equal solutions
if it's greater = two real solutions

Answer 62

okay thanks i pretty much had to relearn everything in this unit before my eoc exam thanks!

Answer 63

Welcome! :D

Answer 64

two real solutions!

Answer 65

cause its 16

Answer 66

Ok, perfect.

Answer 67

thanks bye

Answer 68

:)

Answer 69

Welcome.
Byeee.