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VMariaS [17]
3 years ago
10

Suppose the vertex of a parabola is in the first quadrant and the parabola opens upwards. What can be determined about the value

of a and the discriminant?
Mathematics
1 answer:
schepotkina [342]3 years ago
4 0
A parabola is the graph of a quadratic function, 

that is the graph of f(x)=a x^{2} +bx+c, where a is not 0.

from a, b and c we can derive the following informations about the shape of a parabola:

if a>0, the parabola opens upwards.
if a<0, the parabola opens downwards.

Consider the discriminant D= b^{2} -4ac

If D>0, the parabola intersects the x-axis at 2 points.
If D=0, the parabola intersects the x-axis at 1 point.
If D<0, the parabola does not intersect the x axis.

"<span>the vertex of a parabola is in the first quadrant and the parabola opens upwards.</span>"

the vertex is in the first quadrant means that the vertex is above the x-axis, and it opens upwards, so the parabola does not intersect the x-axis.

This means that:

Answer: a>0, the discriminant D<0
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