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shanice13
23.06.2020 •
Mathematics
F(x) = -4x2 + 12x – 9
What is the value of the discriminant of f?
How many x-intercepts does the graph of f have?
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Ответ:
The graph has 1 x-intercept
Step-by-step explanation:
Given
Required
- Discriminant of f
- Number of x intercepts
Let D represent the discriminant;
D is calculated as thus
Where a, b and c are derived from the following general format;
By comparing
with ![f(x) = -4x^2 + 12x - 9](/tpl/images/0692/0480/5f1e6.png)
We have
Solving further;
So, D can now be calculated;
Hence, the discriminant of f is 0
From the value of the discriminant, we can determine the number of x intercepts of the graph;
When D = 0, then; there exists only one x-intercept and it as calculated as thus
Recall that
So,
becomes
Ответ: