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Flip, Then Shift

Part of the Functions & Transformations section of Coddy's Algebra 2 journey. Lesson 38 of 55.

Flips and shifts combine, and the rule tells you the order. In y=−f(x)+5y = -f\left(x\right)+5 with f(x)=x2f\left(x\right) = {x}^{2}, you work out f(x)f\left(x\right), make it negative, then add 5. So the graph flips first and then moves up 5.

Follow the vertex: (0, 0) flips to (0, 0), then rises to (0, 5). One step right, f gives 1, the flip gives -1, and adding 5 gives 4: the point (1, 4). The curve opens down from its top point at (0, 5).

Compare y=−(f(x)+5)y = -\left(f\left(x\right)+5\right). Here the brackets add 5 first and the minus flips the result, so the top point lands at (0, -5). Read the rule the way you would work out a number, and the order of the moves comes with it.

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Challenge

Draw the graph of y=−f(x)+3y = -f\left(x\right)+3 for f(x)=x2f\left(x\right) = {x}^{2}. The faint curve is f itself. Drag the vertex, then the second point.

Try it yourself

y=−f(x)+3y = -f\left(x\right)+3

Draw the parabola

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This lesson includes a short quiz. Start the lesson to answer it and track your progress.

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