GCSE Maths - How Do You Plot A Quadratic Curve? #77

The video tutorial explains how to plot quadratic graphs by calculating points using a table of values. It emphasizes the importance of drawing smooth curves and checking the graph for accuracy. The tutorial includes a practice exam question, guiding viewers through completing a table, plotting points, and estimating the minimum value of a quadratic function.

What is the equation of the quadratic graph discussed in the video?

• y = X^2 + 2X + 3

• y = X^2 - 2X - 3

• y = X^2 - 3X + 2

• y = X^2 + 3X - 2

How do you determine the Y value when X = -2 for the equation y = X^2 - 2X - 3?

• Y = 3

• Y = 5

• Y = 6

• Y = 4

What is the importance of ensuring the curve is smooth when plotting a quadratic graph?

• It is easier to draw.

• It ensures accuracy and correctness of the graph.

• It makes the graph look nicer.

• It helps in finding the maximum value.

What should you do if your plotted graph has an unexpected bump?

• Add more points to the graph.

• Draw a straight line instead.

• Recheck your calculations for errors.

• Ignore it.

In the example exam question, what is the first step to solve part A?

• Draw the graph.

• Estimate the minimum value of Y.

• Complete the table using the equation.

• Check the graph for accuracy.

What is the estimated minimum value of Y in the example exam question?

• -1.5

• -1.25

• -0.75

• -2

What is the final step in solving the example exam question?

• Estimate the maximum value of Y.

• Recalculate all Y values.

• Estimate the minimum value of Y.

• Draw a straight line through the points.