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andrezito [222]
3 years ago
13

Use the zeros of the following quadratic to find the x-value of the vertex.

Mathematics
1 answer:
jarptica [38.1K]3 years ago
3 0
Just use the following formula:
v= (\frac{-b}{2a}, f( \frac{-b}{2a}))

In this problem, b=2 and a=1

Substitute the values into the formula.

v=(-(2)/2(1), f(-(2)/2(1)))
v=(-1,f(-1))
v=(-1,(-1)²+2(-1)-8)
v=(-1,(1-2-8))
v=(-1,-9)

Therefore, the vertex is (-1,-9).

However, you only wanted the x-value which is in fact -1.

Therefore, the correct answer is "C. -1."


To use the zeroes, just solve the quadratic and find the mean of the two zeroes.

So,
m=\frac{x_{1}+x_{2} }{2}.


Hope this helps!
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