Question
Find all \( x \)-intercepts of the following function. Write your answer or answers as coordinate points. Be sure to select the appropriate number of \( x \)-intercepts. \[ f(x)=\frac{2 x-16}{3 x^{2}+28 x+9} \]
Ask by Osborne Collins. in the United States
Feb 19,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The \( x \)-intercept is \( (8, 0) \).
Solution
To find the \( x \)-intercepts of the function \( f(x) = \frac{2x - 16}{3x^2 + 28x + 9} \), we need to determine where the function equals zero. The \( x \)-intercepts occur when the numerator is equal to zero, as long as the denominator is not also zero at those points.
1. **Set the numerator equal to zero:**
\[
2x - 16 = 0
\]
2. **Solve for \( x \):**
\[
2x = 16 \\
x = 8
\]
Now we have one potential \( x \)-intercept at \( x = 8 \).
3. **Check the denominator to ensure it is not zero at \( x = 8 \):**
\[
3(8)^2 + 28(8) + 9
\]
Calculating this:
\[
3(64) + 224 + 9 = 192 + 224 + 9 = 425
\]
Since the denominator is not zero, \( x = 8 \) is indeed an \( x \)-intercept.
4. **Write the \( x \)-intercept as a coordinate point:**
The \( x \)-intercept is \( (8, 0) \).
Thus, the only \( x \)-intercept of the function is:
\[
\boxed{(8, 0)}
\]
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Extra Insights
To find the \( x \)-intercepts of the function \( f(x)=\frac{2 x-16}{3 x^{2}+28 x+9} \), we set the numerator equal to zero, since the intercepts occur where \( f(x) = 0 \). So, we solve: \[ 2x - 16 = 0 \] Adding 16 to both sides gives: \[ 2x = 16 \] Dividing both sides by 2 yields: \[ x = 8 \] Now, we can write the \( x \)-intercept as a coordinate point. The \( x \)-intercept is at: \[ (8, 0) \] Since the numerator has been solved and the denominator does not affect the \( x \)-intercepts, the only \( x \)-intercept of the function is \( (8, 0) \).