The graph of a quadratic equation opens down when the value of __ is negative.

a
b
c

Question

The graph of a quadratic equation opens down when the value of __  is negative.

a 
b
c

james1107 · Answer

@Liz_Beauty45

fortytherapper · Answer

Ax^2  + Bx + C is the form if that helps

james1107 · Answer

it doesnt really but thanks anyways

james1107 · Answer

@alivejeremy

hexiflexidexi · Answer

Okay, think about this: What does a,b, and c signify in the equation? See which of these take part in defining the slope.

james1107 · Answer

so a or b

alivejeremy · Answer

Maybe A ?

james1107 · Answer

A would make sense i guess if you really think about it

dayakar · Answer

if a is negative

dayakar · Answer

in
$$ax ^{2}+bx +c$$
 if a <0

hexiflexidexi · Answer

:P I plotted the graphs 
x^2+2x+1 (opens upward),
x^2-2x+1 (opens upward),
-x^2+2x+1 (opens downward),
-x^2-2x+1 (opens downward),
on wolframalpha.

hexiflexidexi · Answer

So yea, it seems that the coefficient of x^2 (A) is the cause of the upward/downward facing of the graph. :P