For what value of $$\(a> 0\)$$ is an equilateral triangle formed by the $$\(x\)$$-intercepts and the vertex of the graph of $$\(y=a\left|x^{2}-4 x-21\right| ?\)$$
A.
\(\frac{\sqrt{3}}{4}\)
B.
\(\frac{1}{2}\)
C.
\(\frac{\sqrt{3}}{5}\)
D.
1
Exam No：2016 First Round Grades 10-12 Year：2016 Question No：29
Answer:
C
Knowledge points:
G10-12 - Algebra - Absolute Value (Equations, Inequalities & Graphs)
Solution:
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