Question

If the graph of y = ax2 + bx + c opens down, which of the following must be true?

c > 0

a < 0

c < 0

a > 0

Answer 1

@whpalmer4 @random231 @TuringTest

Answer 2

a>0
c>0

Answer 3

@ravikr.iit its multiple choice

Answer 4

then only a>0
i thought more than one could be right! :-P

Answer 5

@ravikr.iit thank you

Answer 6

@miryvianey
:-)

Answer 7

If you have \[y = ax^2+bx+c\] the parabola opens upward if \(a>0\) and downward if \(a<0\)

This is easily seen by graphing a few points of \[y = x^2\] and \[y = -x^2\]