Questions: Without graphing, find the x - and y-intercepts for f(x).
f(x)=x^2-8x+2
Select the correct choice below and fill in any answer boxes in your choice.
A. There is no x-intercept.
B. The x-intercept(s) are
(Type an integer or decimal rounded to the nearest tenth as needed. Use a comma to separate answers as needed.)
A. The y-intercept(s) are .
(Type an integer or decimal rounded to the nearest tenth as needed. Use a comma to separate answers as needed.)
B. There is no y-intercept.
Transcript text: Without graphing, find the $x$ - and $y$-intercepts for $f(x)$.
\[
f(x)=x^{2}-8 x+2
\]
Select the correct choice below and fill in any answer boxes in your choice.
A. There is no x-intercept.
B. The $x$-intercept(s) are $\square$
(Type an integer or decimal rounded to the nearest tenth as needed. Use a comma to separate answers as needed.)
A. The y-intercept(s) are $\square$ .
(Type an integer or decimal rounded to the nearest tenth as needed. Use a comma to separate answers as needed.)
B. There is no y-intercept.
Solution
Solution Steps
Step 1: Finding $x$-intercepts
To find the $x$-intercepts of the function $f(x) = x^2 - 8x + 2$, we set $f(x) = 0$ and solve the quadratic equation.
The discriminant, $\Delta = b^2 - 4ac = -8^2 - 4\cdot1\cdot2 = 56$, determines the nature of the roots.
Since $\Delta > 0$, there are two distinct real x-intercepts at x = 7.7 and x = 0.3.
Step 2: Finding $y$-intercept
To find the $y$-intercept, we set $x = 0$ in the function, which gives $f(0) = 2$.
Therefore, the $y$-intercept is always at the point $(0, 2)$.
Final Answer:
The function $f(x) = x^2 - 8x + 2$ has two distinct real x-intercepts at x = 7.7 and x = 0.3. The $y$-intercept is at $(0, 2)$.