Question

HELP WILL MEDAL
Determine in which direction the parabola below opens.

y = -3x^2 + 5x + 11

Answer 1

the negative in front of the squared term coefficient probably means downwards

Answer 2

test a couple points about the axis of symmetry and see

Answer 3

so would the answer be left???

Answer 4

http://awesomescreenshot.com/04051xwjad

Answer 5

@DanJS so would the answer be up???

Answer 6

I'm pretty sure it opens downward

Answer 7

Plot[11 + 5 x - 3 x^2, {x, -1.7, 3.3}]

Answer 8

click on the link , it is downwards

Answer 9

The slope of any tangent line to the parabola will be in the form -
y=mx + b
y=-3x + 5

Slope of -3, the thing is decreasing , opening down