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If the inverse of a square root function is a quadratic function, why do the graphs differ

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7 votes

Final answer:

The graphs of inverse functions like a square root function and its quadratic counterpart differ because they represent inverse operations. A quadratic graph is a parabola, whereas a square root graph is a steadily rising curve. These contrasts highlight the fundamental differences between squaring and taking a root.

Step-by-step explanation:

The reason the graphs of inverse functions such as a square root function and its corresponding quadratic function differ is due to their contrasting relationships. A quadratic function is a second-order polynomial and its graph is a parabola which opens upwards or downwards. On the other hand, the graph of a square root function generally forms a curve that starts at a point on the y-axis and rises steadily to the right.

As inverse functions, they 'undo' each other. If the square root function represents the operation of finding a root (essentially, 'what number squared gives me this value?'), the quadratic function represents the operation of squaring. When we graph these functions on a two-dimensional (x-y) graphing system, the independent variable is plotted on the x-axis and the dependent variable on the y-axis. The shapes of these functions are inherently different because they represent fundamentally different mathematical operations.

In the context of the Pythagorean Theorem, isolating a variable often requires 'undoing' the square by taking the square root, which shifts from a quadratic representation ‘a²’ to its inverse square root form 'a'.

User WilliamEllisWebb
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8.0k points
9 votes
They don’t. The square root function is a horizontal quadratic.
User Songyy
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8.2k points

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