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I'm studying for a call and my teacher says the key points I should go over are (his words): "solving quadractics and what do the graphs do"
What exactly does he mean by "what do the graphs do"?
Um I think your teacher meant relating the graph to the equation.
Solving quadratic equations gives you roots, which sometimes you'd get No Real Roots, or Two Real Roots, or One Real Root
Given \(ax^2+bx+c=0\), using b^2-4ac
|dw:1380216159086:dw|
|dw:1380216208509:dw|
|dw:1380216228972:dw|
No Real Roots, b^2-4ac<0
Two Real Roots, b^2-4ac>0
One Real Root, b^2-4ac=0
^ that's something i can consider, okay. all i'm looking for (sam and others) is just a statement like that. are quadratic graphs used to plot things, show how to get a value... what.
Solving quadratics mean solving for x right?
\[x=\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }\]
I assume you know the above equation? That's where the b^2-4ac comes from.
The roots are the solutions for x.