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Lesson 7:

Explaining a Parameter Change

Sasha and Keoni use algebraic and geometric thinking to form three arguments that justify why a parabola gets wider on the coordinate grid as the p-value in y = x^{2}/(4p) increases.

Episode 1: Making Sense

Sasha and Keoni review the relationship that they discovered between the value of p in the equation y = x^{2}/(4p) and the width of the graph of the parabola.

Episode 2: Exploring

Keoni and Sasha use points that share an x-value to explain why increasing the p-value in the equation y = x^{2}/(4p) results in the parabola getting wider.

Episode 3: Reflecting

Keoni and Sasha reflect on why increasing the p-value results in a wider parabola. They engage in algebraic reasoning to support their argument.

Episode 4: Repeating Your Reasoning

Sasha and Keoni use points on three parabolas that share a y-value to explain why increasing the p-value results in the parabola getting wider on the coordinate grid.

Episode 5: Making Sense

Sasha and Keoni use “the special points” on the three parabolas to generate another explanation for why increasing the p-value results in the parabola getting wider on the coordinate grid.

Episode 6: Exploring

Sasha and Keoni use what they know about special points to explain why increasing the p-value results in the parabola getting wider on the coordinate grid.