Does the graph of the function y=3(x−1)−−−−−−√3

show that the function is increasing or decreasing?(1 point)
Responses

increasing
increasing

decreasing
decreasing

Neither increasing nor decreasing
Neither increasing nor decreasing

Both increasing and decreasing
Both increasing and decreasing

1 answer

To determine whether the function \( y = 3\sqrt{x-1} \) is increasing or decreasing, we can analyze the behavior of the function as \( x \) changes.

  1. Domain: The function is defined for \( x \geq 1 \) (because of the square root).

  2. Derivative: To find out if the function is increasing or decreasing, we can look at the derivative of the function:

    \[ y = 3\sqrt{x-1} \]

    Using the chain rule to differentiate:

    \[ y' = 3 \cdot \frac{1}{2\sqrt{x-1}} \cdot (1) = \frac{3}{2\sqrt{x-1}} \]

  3. Sign of the Derivative: The derivative \( y' = \frac{3}{2\sqrt{x-1}} \) is positive for all \( x > 1 \). Since the derivative is positive in the domain \( x \geq 1 \), this means that the function is increasing in this interval.

Conclusion: The graph of the function \( y = 3\sqrt{x-1} \) shows that the function is increasing.

So the correct response is:

increasing.

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