Y9. Algebra. Quadratic Equations. Graphs

Let us start by reminding ourselves how to plot points on a set of Cartesian axes. We can open Desmos or Geogebra for an example of axes.

To draw a graph of a quadratic equation we need to substitute in various values of x to find their corresponding values of y. Then each pair of values (x,y) gives us a point on the curve which the quadratic equation represents. The shape of the curve of a quadratic equation will always be a parabola.

Let’s try plotting the curve for the quadratic equation y=3x2-4x+1


Let’s complete exercise 19A on page 309 of the textbook:

The answers are below:

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