- Preetha

What is the best way to solve this quadratic: x2 + 3x – 4 = 0

- jamiebookeater

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- Preetha

- AlexandervonHumboldt2

hmm it looks like only quadratic formula is the best way

- anonymous

Well I guess it would be best first to check with the discriminant :P

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## More answers

- mathmate

I suggest factoring.

- AlexandervonHumboldt2

yeah

- ganeshie8

quadratic formula ofcourse!
|dw:1444068957844:dw|

- AlexandervonHumboldt2

lets listen to ganishe

- just_one_last_goodbye

WAIT!!! let me have a try please ^_^

- AlexandervonHumboldt2

yeah preetha
substitute the values using the quadratic formula solve the equation

- just_one_last_goodbye

x2 + 3x – 4 = 0
Refine:
5x - 4 = 0
Add 4 to both sides:
5x - 4 + 4 = 0 + 4
5x=4
Divide both sides by 5:
\[\frac{ 5x }{ 5 } = \frac{ 4 }{ 5 } \]
Answer:
\[x = \frac{ 4 }{ 5 }\]

- AlexandervonHumboldt2

The quadratic formula is (-b+-sqrt(b^2 - 4ac))/2a where ax^2+bx+c=0
a=1
b=3
c=-4 substitute values and solve;

- AlexandervonHumboldt2

@just_one_last_goodbye you gave an answer lol coc lol

- just_one_last_goodbye

Pfft I gave the answer why? because c;' I know @Preetha is very smart to already know the answer

- Preetha

That is fine, I do have a couple of strategies now to use. And I do understand this. Thanks all for jumping in.

- AlexandervonHumboldt2

yeahhhhh i know k jk

- imqwerty

best way is to use common sense :)
we can easily see that x=1 is a root
and sum of roots is -b/a =3
so 1 root is1
another will be 3-1=2

- Preetha

Its actually fascinating how you all have different strategies to solve this - that is very good to know.

- just_one_last_goodbye

No problem Mrs. Ram ^-^ Do I get at least 5 owl bucks? I always wanted to know what it would look like on my account

- imqwerty

(:

- just_one_last_goodbye

~sigh~ . - .

- just_one_last_goodbye

WEE THE OWL BUCKS ;-; omg... thank you so much <3 I love u guys so much...

- imqwerty

oops i did a silly mistake
sum of roots ==> -b/a=-3
and one root is 1
so other root is -4

- Nnesha

it's \[\huge\rm x^2+3x-4=0\] x squared not 2x+3x :=)
`squared` that's what makes it quadratic :=) just_one_last :=)

- Nnesha

as suggested above factoring would be great
and AC (headphone :P ) method the best!

- anonymous

Preetha is asking a question!!!??? OMG! The world is ending!!!

- Jaynator495

|dw:1444693788595:dw|
Click the sphere.

- Jaynator495

|dw:1444693919314:dw|
Or click anywhere on this canvas

- Jaynator495

\(\color{#0cbb34}{\text{Originally Posted by}}\) @jinxhead20
Preetha is asking a question!!!??? OMG! The world is ending!!!
\(\color{#0cbb34}{\text{End of Quote}}\)
not the first time, she can often be found asking questions to take notes on how people answer them :P

- TheSmartOne

Unfortunately, x2 + 3x – 4 = 0 is not a quadratic equation.

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