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Consider the quadratic function: f(x) = x2 – 8x – 9 Vertex: (-b/2a, f(-b/2a)) What is the vertex of the function?

Consider the quadratic function: f(x) = x2 – 8x – 9 Vertex: (-b/2a, f(-b/2a)) What is the vertex of the function?
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Consider the quadratic function: f(x) = x2 – 8x – 9 Vertex: (-b/2a, f(-b/2a)) What is the vertex of the function?

asked
User Dilico
by
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2 Answers

3 votes
The answer is 4 & -25 on e2020
answered
User Rpkelly
by
8.1k points
1 vote
X = -b/2a = 8/2 = 4

y = 16 -8*4 -9 = 16 - 32 -9 = -25

the vertex is (4,-25)
answered
User Dguay
by
7.9k points
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