Question
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Answer
The graph of
is a downward-opening parabola with its vertex at
,
-intercepts at
and
, and a
-intercept at
.
Solution
-
Write the quadratic function:
-
Factor out
from the quadratic and linear terms: -
Complete the square inside the parentheses. Recall that for
we add and subtract : -
Substitute the completed square back into the equation:
-
Distribute the negative sign:
-
Identify key features of the parabola from the vertex form
: - The vertex is at
. - The coefficient of
is negative, so the parabola opens downward.
- The vertex is at
-
Find the
-intercepts by setting : Use the quadratic formula:Thus, -
Find the
-intercept by setting : -
To select the correct graph among the options, look for one that:
- Has a vertex at
. - Opens downward.
- Intersects the
-axis at and . - Intersects the
-axis at .
- Has a vertex at
The graph matching these features is the one that represents
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Extra Insights
When plotting the equation
, you’re looking at a downward-opening parabola because the coefficient of
is negative. The vertex can be found using the formula
, which helps to locate the peak point of the parabola. In this case, it will yield a vertex at
, and substituting that back into the equation will help determine the vertex’s y-coordinate.
To visualize the graph correctly, you want to plot the vertex and find the intercepts. The y-intercept occurs when
, giving you the point
. From this, you can sketch the curve that opens downward, showing that the graph has a maximum point at the vertex and intersects the y-axis at
.