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Hello! Could someone please explain to me what is a quadratic equation? I still don’t quite get it. Is it a way to solve an equation equal to zero? How do you use it?

 

Thanks, and have a nice day!☆*:.。. o(≧▽≦)o .。.:*☆

 Oct 27, 2019
 #1
avatar+101 
+2

A quadratic equation is a non-linear relationship between x and y. 

For the secod part of your equation where you wonder is it meant to solve for 0, that's isn't always the case.

The reason sometimes a quadratic equation will be equal to 0, is when you are looking for the x-intercepts of your parabola. The reason why it's equal to 0 when you look for the x-intercepts is because the x-intercepts are always on the x-axis. Any point on the x-axis has a y-value of 0. This is why when we look for the x-interecepts, the y value is set to 0. We are solving for x when y = 0. 

 Oct 27, 2019
 #2
avatar+66 
+1

Wow! Thanks! I have another question (sorryy):

In the picture above, is the blue line the parabola?

 

(btw i found this on the web so I’m not sure if this is correct at all ;-;)

milkcloud  Oct 27, 2019
 #3
avatar+656 
+3

yes!! the blue line is a parabola! 

a parabola is just a line that curves exactly in the way that you see it in the image that you posted =)

Nirvana  Oct 27, 2019
 #6
avatar+66 
+1

Ok, ty!!

milkcloud  Oct 28, 2019
 #4
avatar+236 
+4

It might benefit you to learn about the quadratic equation as well. It is (-b +- √b^2 - 4ac)/(2a). It is commonly used to solve quadratic equations of form ax^2 + bx + c. There are also many other ways to solve, such as completing the square. I'd recommend learning about them, they are very interesting!

 Oct 27, 2019
 #5
avatar+66 
+2

Ok! I'll look into that as well. Thanks!

milkcloud  Oct 28, 2019
 #7
avatar+236 
+2

You're welcome!

ThatOnePerson  Oct 28, 2019

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