Question

1) WILL BE GIVING MEDAL AND FAN!!!

Use the quadratic formula to solve 2y2 – 10y + 8 = 0.

a. {–4, –1}

b. {4, –1}

c. {–4, 1}

d. {4, 1}

Answer 1

First list out your
a
b
c values

Answer 2

what are they?

Answer 3

ok..I know how but....?

Answer 4

ill do them rn

Answer 5

Factor out the common factor first.

Answer 6

Then work your way on factoring the rest

Answer 7

a. 2
b. 10
c. 8

Answer 8

it says to use the quadratic formula...not factor

Answer 9

right?

Answer 10

ohhh then im not sure sat all

Answer 11

Oh, i just noticed that xD

Answer 12

b is wrong

Answer 13

would it be A?

Answer 14

No the value

Answer 15

@brae , do you know what the quadratic formula look like?

Answer 16

\[\frac{ x = -b ± \sqrt(b^2 - 4ac) }{ 2a } \]

Answer 17

ummm...wait one sec, I have it in my notes

Answer 18

lol i posted it XD

Answer 19

ohh thats right!!

Answer 20

kidrah, the x shouldn't be in the numerator :X

Answer 21

my bad :P doesnt make a diffrence >_<

Answer 22

So @brae , what does the a, b, and c indicate in the quadratic formula, kidrah listed ?

Answer 23

isnt it this?

a. 2
b. 10
c. 8

Answer 24

Do you have any idea for where constants came from?

Answer 25

B is still wrong

Answer 26

yes I learned it today

Answer 27

(2y^3) (-10y) (+8)

Answer 28

its not 10

Answer 29

ohh is B -10

Answer 30

mhm

Answer 31

yay!

Answer 32

\[\frac{ x = -(-10) ± \sqrt((-10)^2 - 4(2)(8) }{ 2(2) } \]

Answer 33

now you just have to solve

Answer 34

The standard quadratic equation is ually written like this
\(\Large ax^2+bc+c=0\)
and there's a proof for this standard equation that converts to the qudratic formula where you solve x, only.

Answer 35

Is the answer A??

Answer 36

i think lol

Answer 37

maybe not ha

Answer 38

But since your variable is y
\(ay^2+by+c=0\)
\(2y^2 – 10y + 8 = 0\)
a=?
b-?
c=?
\(y=\LARGE \frac{-b\pm \sqrt{b^2-4ac}}{2a}\)

Answer 39

Plug and chug

Answer 40

ok...

Answer 41

and show your work :)

Answer 42

ummm ok i messed up and is really confused lol

Answer 43

@Zale101

Answer 44

Show me what you had.

Answer 45

im confused

Answer 46

but its weird because i learned it today in class

Answer 47

Here is a good example of a quadratic equation being plugged into the quadratic formula.

http://www.mathplanet.com/images/math/codecogs_d3fa4daa.gif

plug and chug, and do some calculator crunches

Answer 48

ohh ok so the answers there was 5 and -2

Answer 49

This is just an example i pulled off of google, but try to see how they got those two answers.

Answer 50

ok

Answer 51

does anyone know the answer?

Answer 52

@Zale101 @kidrah69

Answer 53

2y2 – 10y + 8 = 0

a=2
b=-10
c=8

x= [--10 +- sqroot (100 - 4*2*8)]/2*2

x = [10 +- sqroot(36)] /4
x = [10 + 6] / 4
x1= 4

x2 = [10 - 6] / 4
x2 = 4 / 4
x2=1

Answer is d

Answer 54

can i tag u in other problems that i have to do?

Answer 55

okay - as long as it's not too many others
How about just one more problem?

Answer 56

ya thanks!