Identify the quadratic function from the choices below whose parabola opens downward.
A. y = -5x + x^2
B. y = 2x^2 – 4x
C. y = x^2 – 11x + 7
D. y = x – 2x^2 + 9

Question

Identify the quadratic function from the choices below whose parabola opens downward.
A. 	y = -5x + x^2 
B. 	y = 2x^2 – 4x 
C. 	y = x^2 – 11x + 7 
D. 	y = x – 2x^2 + 9

luigi0210 · Answer

Look for a negative sign in front of the function..

luigi0210 · Answer

|dw:1397240373997:dw|
Excuse my awful drawing talents /.\

anonymous · Answer

wouldn't it be D because the squared x's coefficient is negative @Luigi0210

luigi0210 · Answer

Yup!

luigi0210 · Answer

And 100 now ;)

anonymous · Answer

Can you help me with this one 


The graph of y = -3x2- 2x - 5 has a:
A. 	Maximum 
B. 	Minimum 


 @Luigi0210

luigi0210 · Answer

Well look at the leading term, it's negative.. meaning this one |dw:1397240904302:dw|
And right there at the top is the highest point it will be, so a max.