Use the zeros of the following quadratic to find the x-value of the vertex.
1 answer:
Just use the following formula:
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,
.
Hope this helps!
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,
Hope this helps!
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