Can you explain how stretch math is done?

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I only found Stretch math as a course offered by upenn. It is used as an introduction to Calculus type concepts to students who will be entering the university as freshman. This was offered as a summer course. It covers definitions of derivatives and integrals. The end of the course begins covering first derivatives.

Stretch math is some sort of the process where you stretch a graphical curve into different magnitudes. The curve would be moving further and further from the X-axis, increasing in magnitude or lowering of magnitude. It can lead to a narrowing or widening of the quadratic curve, but the vertex would not change. Vertical stretching is the reciprocal of the numerical coefficient of the y-value.

If coefficient is 2, then there would be a vertical stretching of 1/2. If it is 1/3, there would be a VS of 3.

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