# Quick Answer: When graphed, which parabola opens downward?

## What is a parabola that opens downward?

If a<0 in f(x)=ax2+bx+c, the parabola opens downward. In this case the vertex is the maximum, or highest point, of the parabola. Again, a large negative value of a makes the parabola narrow; a value close to zero makes it wide.

## What is it called when a parabola opens up?

are called parabolas. The vertex of a parabola opening upward is also called the minimum point. The vertex of a parabola opening downward is also called the maximum point. The x-intercepts are called the roots, or the zeros.

## What do you call the highest point of a parabola that opens downward?

If the parabola opens down, the vertex represents the highest point on the graph, or the maximum value. In either case, the vertex is a turning point on the graph. The graph is also symmetric with a vertical line drawn through the vertex, called the axis of symmetry.

## What is the standard form of a parabola that opens up or down?

The directrix is the line y = k – p. The axis is the line x = h. If p > 0, the parabola opens upward, and if p < 0, the parabola opens downward. If a parabola has a horizontal axis, the standard form of the equation of the parabola is this: (y – k)2 = 4p(x – h), where p≠ 0.

## How do you tell if a parabola opens upward or downward?

There is an easy way to tell whether the graph of a quadratic function opens upward or downward: if the leading coefficient is greater than zero, the parabola opens upward, and if the leading coefficient is less than zero, the parabola opens downward.

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## How do you tell if a parabola opens left or right?

Let’s look at a few key points about these patterns:

1. If the x is squared, the parabola is vertical (opens up or down). If the y is squared, it is horizontal (opens left or right).
2. If a is positive, the parabola opens up or to the right. If it is negative, it opens down or to the left.
3. The vertex is at (h, k).

## What is a parabolic curve?

In mathematics, a parabola is a plane curve which is mirror-symmetrical and is approximately U-shaped. The parabola is the locus of points in that plane that are equidistant from both the directrix and the focus.

## What does the A represent in a parabola?

For graphing, the leading coefficient “a” indicates how “fat” or how “skinny” the parabola will be. Parabolas always have a lowest point (or a highest point, if the parabola is upside-down). This point, where the parabola changes direction, is called the “vertex”.

## How do you know if an equation is a parabola?

If they are, then these characteristics are as follows:

1. Circle. When x and y are both squared and the coefficients on them are the same — including the sign.
2. Parabola. When either x or y is squared — not both.
3. Ellipse. When x and y are both squared and the coefficients are positive but different.
4. Hyperbola.

## How do you know if a parabola is maximum or minimum?

If the parabola opens up, the vertex represents the lowest point on the graph, or the minimum value of the quadratic function. If the parabola opens down, the vertex represents the highest point on the graph, or the maximum value.

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## What is the top point of a parabola?

A parabola which opens up has a lowest point and a parabola which opens down has a highest point. The highest or lowest point on a parabola is called the vertex.

## Why is a parabola a strong shape?

Why is the parabola considered such a strong shape? The parabola is considered such a strong shape because of its natural oval shape. Both ends are mounted in a fixed bearing while the arch has a uniformly distributed load. When an arch carries only its own weight, the best shape is a catenary.

## What is the C in standard form?

The standard form for linear equations in two variables is Ax+By=C. For example, 2x+3y=5 is a linear equation in standard form. When an equation is given in this form, it’s pretty easy to find both intercepts (x and y). This form is also very useful when solving systems of two linear equations.

## How do you turn a parabola into standard form?

Not all equations come packaged that way, though. You may have to do some work on the equation first to be able to identify anything about the parabola. The standard form of a parabola is (x – h)2 = a(y – k) or (y – k)2 = a(x – h), where (h, k) is the vertex.

## What is standard form of a quadratic function?

The quadratic function f(x) = a(x – h)2 + k, a not equal to zero, is said to be in standard form. If a is positive, the graph opens upward, and if a is negative, then it opens downward. The line of symmetry is the vertical line x = h, and the vertex is the point (h,k).