+0

0
116
7
+85

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
+105
+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
+85
+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
+681
+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
+85
+1

Ok, ty!!

milkcloud  Oct 28, 2019
#4
+308
+5

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
+85
+2

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

milkcloud  Oct 28, 2019
#7
+308
+3

You're welcome!

ThatOnePerson  Oct 28, 2019