Pregunta
Analyze the polynomial function \( f(x)=x^{2}(x-3) \) using parts (a) through (e). (a) Determine the end behavior of the graph of the function. The graph of \( f \) behaves like \( y=x^{3} \) for large values of \( |x| \). (b) Find the \( x \) - and \( y \)-intercepts of the graph of the function. The \( x \)-intercept(s) is/are 0,3 . (Simplify your answer. Type an integer or a fraction. Use a comma to separate answers as needed. Type each answer only once.) The \( y \)-intercept is 0 . (Simplify your answer. Type an integer or a fraction.) (c) Determine the zeros of the function and their multiplicity. Use this information to determine whether the graph crosses or touches the \( x \)-axis at each \( x \)-interce The zero(s) of \( f \) is/are \( \square \). (Simplify your answer. Type an integer or a fraction. Use a comma to separate answers as needed. Type each answer only once.)
Ask by Ball Simpson. in the United States
Feb 24,2025
Solución de inteligencia artificial de Upstudy
Respuesta verificada por el tutor
Responder
The zeros of \( f(x) \) are 0 and 3. At x = 0, the graph touches the x-axis, and at x = 3, it crosses the x-axis.
Solución
We start with the given function:
f(x) = x²(x – 3)
Part (a): End behavior
The degree of f(x) is 3 (a cubic) and the leading term (after expansion) is x³. Therefore, for large |x|, the graph of f behaves like y = x³:
• As x → ∞, f(x) → ∞.
• As x → –∞, f(x) → –∞.
Part (b): Intercepts
• x-intercepts: Set f(x) = 0:
x²(x – 3) = 0 ⇒ x = 0 or x – 3 = 0 ⇒ x = 3.
Thus, the x-intercepts are x = 0 and x = 3.
• y-intercept: Evaluate f(0):
f(0) = 0²(0 – 3) = 0.
Thus, the y-intercept is y = 0.
Part (c): Zeros and their Multiplicities
The function factors as f(x) = x²(x – 3), so the zeros are:
• x = 0 (this factor appears as x², so its multiplicity is 2).
• x = 3 (this factor appears to the power 1, so its multiplicity is 1).
Interpretation regarding the x-axis:
• At x = 0, because the multiplicity is 2 (an even number), the graph touches the x-axis at this zero and bounces off.
• At x = 3, because the multiplicity is 1 (an odd number), the graph crosses the x-axis at this zero.
Thus, the zeros of f(x) are 0 and 3; the graph touches at x = 0 and crosses at x = 3.
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Como
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Extra Insights
The zeros of \( f \) are 0 (with a multiplicity of 2) and 3 (with a multiplicity of 1). This means that the graph will touch the x-axis at \( x = 0 \) and cross it at \( x = 3 \). To further corroborate these findings, analyzing the multiplicities reveals that even multiplicities (like the 2 at zero) indicate the graph touches the x-axis, remaining on the same side, while odd multiplicities (like the 1 at three) mean the graph crosses the x-axis, switching sides as it does. This gives us an insight into how the polynomial interacts with the x-axis.
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