# How do you know if the vertex is above or below the x-axis?

Table of Contents

## How do you know if the vertex is above or below the x-axis?

If the coefficient of the x2 term is positive, the vertex will be the lowest point on the graph, the point at the bottom of the “ U ”-shape. If the coefficient of the x2 term is negative, the vertex will be the highest point on the graph, the point at the top of the “ U ”-shape.

## Which equation lies entirely above the X-axis?

Only equation 3 is an upward parabola whose vertex lies above the x-axis.

## How do you put vertex form into standard form?

Vertex form to standard form converter

- Write the parabola equation in the vertex form: y = a*(x-h)² + k ;
- Expand the expression in the bracket: y = a*(x² – 2*h*x + h²) + k ;
- Multiply the terms in the parenthesis by a : y = a*x² – 2*a*h*x + a*h² + k ;

## How do you find the vertex in Khan Academy?

One of the common forms for quadratic functions is called vertex form, because it highlights the coordinates of the vertex of the function’s graph….

- Make the function look like ax^2 + bx + c = 0.
- Use the vertex formula to find it. x = -b / 2a.
- Use the x value to find the y value.

## What is the B in standard form?

B-value: The b-value is the middle number, which is the number next to and multiplied by the x; a change in the value of b affects the parabola and the resulting graph.

## What is slope in standard form?

The slope of a line is the rate of change of y with respect to x. The slope-intercept form of a linear equation is y = mx + b, where m is the slope of the line. The standard form of a linear equation is Ax + By = C. When we want to find the slope of the line represented by this equation, we have two options.

## How do I calculate slope?

To calculate percent slope, divide the difference between the elevations of two points by the distance between them, then multiply the quotient by 100. The difference in elevation between points is called the rise. The distance between the points is called the run. Thus, percent slope equals (rise / run) x 100.

## What does a undefined slope look like?

Basically, a slope that is undefined looks like the lines on the coordinate system you see below: When a slope is undefined all you do is moving straight up or straight down only. You are not moving horizontally at all. In other words, the run is zero.