- anonymous

how do i do quadratics equations??
i get totally loss when im doing this

- jamiebookeater

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- anonymous

What about quadratic equations?

- MeowLover17

Okay so first off lets identify quadratics

- MeowLover17

x^2-x+1=0 is a quadratic

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## More answers

- MeowLover17

How do you know this you may ask? Well first off the X's exponent cuts in half

- MeowLover17

Now to solve for a quadratic there are two ways that are most commonly used

- MeowLover17

First there is the Quadratic Formula that you may or may not know, which is

- anonymous

o.O im confused once more

- MeowLover17

\[b \pm \sqrt{b^2-4ac//2}\]

- MeowLover17

We could solve a quadratic if you have one available and i'll walk you through the steps.

- MeowLover17

Would you like to solve a simple quadratic with me?

- anonymous

ok?

- MeowLover17

\[8x^2+16x-20=0\]

- MeowLover17

Do you know how to solve this?

- Nnesha

there is a typo you forgot - and a at the denominator
\[\huge\rm \frac{ \color{red}{- }b \pm \sqrt{b^2 -4ac} }{ 2\color{reD}{a} }\]
quadratic formula
where abc values are \[\huge\rm Ax^2 +Bx+C=0\]

- MeowLover17

@Nnesha Sorry thank you for catching that :D

- Nnesha

np :-)

- MeowLover17

Ok onlii_bri lets try to solve to quadratic above, would you like to use the quadratic formula or split it up?

- anonymous

|dw:1433635733307:dw|

- MeowLover17

Whats that o-o

- anonymous

dats how my teacher taught how to do it

- MeowLover17

Lets do a different way for now,

- MeowLover17

I'll work out the entire problem then i want you to try okay?

- anonymous

ummm i have ncse in my country and my maths test is monday
i need to learn it that way

- anonymous

ok

- MeowLover17

Idk how to do it that way sorry :( i only know how i learnt it from my algebra 2 and algebra 1 teachers.

- MeowLover17

Maybe you are getting lost because your using a very traditional way of doing it

- anonymous

im still on basic algebra

- MeowLover17

Oh okay, thats alright let me give you a little lesson on quadratics and it will make it a whole lot easier to understand, ask me any questions as i go.

- MeowLover17

\[Ax^2+Bx+C=0\]

- MeowLover17

That is how you identify a quadratic

- MeowLover17

Now they can also look like this 3x^2+9x+10=0

- MeowLover17

Quadratics must always be equal to zero in order to be a quadratic.

- MeowLover17

\[3x^2+9x+10=0\]

- MeowLover17

Lets solve for the quadratic above very quickly.

- MeowLover17

|dw:1433636159214:dw|

- MeowLover17

First step is to multiply what is Squared by the constant. in this case we have 3

- MeowLover17

3*10 = 30

- MeowLover17

Now you must break down the multiples of 30 to see if any of them add up to 9.

- MeowLover17

Well scratch that there are no multiplies of 30 that can add up or subtract to equal 9, so in this case we will use the quadratic formula.

- MeowLover17

|dw:1433636365799:dw|

- MeowLover17

|dw:1433636435572:dw|

- MeowLover17

So far so good?

- MeowLover17

Now you just plug in those numbers into the equation then plug into your calculator.

- MeowLover17

If you need anymore help just ask, were all here to help.

- MeowLover17

Also just so you know the -B is the lower case b in the equation above i just capitalized it by accident.

- MeowLover17

https://www.youtube.com/watch?v=3ayhvAI3IeY use this to help you.

- anonymous

ok

- anonymous

thanx

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