anonymous
  • anonymous
how do i do quadratics equations?? i get totally loss when im doing this
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
What about quadratic equations?
MeowLover17
  • MeowLover17
Okay so first off lets identify quadratics
MeowLover17
  • MeowLover17
x^2-x+1=0 is a quadratic

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MeowLover17
  • MeowLover17
How do you know this you may ask? Well first off the X's exponent cuts in half
MeowLover17
  • MeowLover17
Now to solve for a quadratic there are two ways that are most commonly used
MeowLover17
  • MeowLover17
First there is the Quadratic Formula that you may or may not know, which is
anonymous
  • anonymous
o.O im confused once more
MeowLover17
  • MeowLover17
\[b \pm \sqrt{b^2-4ac//2}\]
MeowLover17
  • MeowLover17
We could solve a quadratic if you have one available and i'll walk you through the steps.
MeowLover17
  • MeowLover17
Would you like to solve a simple quadratic with me?
anonymous
  • anonymous
ok?
MeowLover17
  • MeowLover17
\[8x^2+16x-20=0\]
MeowLover17
  • MeowLover17
Do you know how to solve this?
Nnesha
  • 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
  • MeowLover17
@Nnesha Sorry thank you for catching that :D
Nnesha
  • Nnesha
np :-)
MeowLover17
  • MeowLover17
Ok onlii_bri lets try to solve to quadratic above, would you like to use the quadratic formula or split it up?
anonymous
  • anonymous
|dw:1433635733307:dw|
MeowLover17
  • MeowLover17
Whats that o-o
anonymous
  • anonymous
dats how my teacher taught how to do it
MeowLover17
  • MeowLover17
Lets do a different way for now,
MeowLover17
  • MeowLover17
I'll work out the entire problem then i want you to try okay?
anonymous
  • anonymous
ummm i have ncse in my country and my maths test is monday i need to learn it that way
anonymous
  • anonymous
ok
MeowLover17
  • 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
  • MeowLover17
Maybe you are getting lost because your using a very traditional way of doing it
anonymous
  • anonymous
im still on basic algebra
MeowLover17
  • 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
  • MeowLover17
\[Ax^2+Bx+C=0\]
MeowLover17
  • MeowLover17
That is how you identify a quadratic
MeowLover17
  • MeowLover17
Now they can also look like this 3x^2+9x+10=0
MeowLover17
  • MeowLover17
Quadratics must always be equal to zero in order to be a quadratic.
MeowLover17
  • MeowLover17
\[3x^2+9x+10=0\]
MeowLover17
  • MeowLover17
Lets solve for the quadratic above very quickly.
MeowLover17
  • MeowLover17
|dw:1433636159214:dw|
MeowLover17
  • MeowLover17
First step is to multiply what is Squared by the constant. in this case we have 3
MeowLover17
  • MeowLover17
3*10 = 30
MeowLover17
  • MeowLover17
Now you must break down the multiples of 30 to see if any of them add up to 9.
MeowLover17
  • 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
  • MeowLover17
|dw:1433636365799:dw|
MeowLover17
  • MeowLover17
|dw:1433636435572:dw|
MeowLover17
  • MeowLover17
So far so good?
MeowLover17
  • MeowLover17
Now you just plug in those numbers into the equation then plug into your calculator.
MeowLover17
  • MeowLover17
If you need anymore help just ask, were all here to help.
MeowLover17
  • MeowLover17
Also just so you know the -B is the lower case b in the equation above i just capitalized it by accident.
MeowLover17
  • MeowLover17
https://www.youtube.com/watch?v=3ayhvAI3IeY use this to help you.
anonymous
  • anonymous
ok
anonymous
  • anonymous
thanx

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