Question

Identify the quadratic function from the choices below whose parabola opens downward.(Points : 1)
y = 10x – 3x2
y = 4x2 – 6x – 3
y = x2 – 10x + 5
y = 8x + 5x2 – 3

Answer 1

y = 10x – 3x2

Answer 2

You need to know that for any parabola that opens either upward of downward, the equation is, y= ax^2 +bx +c...

Now, if a<0, parabola opens downward
and if a>0, it opens upward...

Similarly, for those parabolas that open sideways, equation is, x=ay^2+by +c

if a<0, parabola opens leftside and if a>0, parabola opens right side...

Now, figure out your answer yourself...

Answer 3

y = x – 2x2 + 9

Answer 4

Thanx beb :)

Answer 5

ur welme