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karenrivera22
23.12.2019 •
Mathematics
Use the zeros of the following quadratic to find the x-value of the vertex.
y = x^2 + 2x -8
a. 2
b. 1
c. -1
d. -8
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Ответ:
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!
Ответ:
yez i agree they r all even