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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Answer:
The percent error of Heather's calculation is <u>8%</u>.
Step-by-step explanation:
Given:
Heather measures the temperature of her coffee to be 133.4 degrees fahrenheit. It is actually 145 degrees fahrenheit.
Now, to find the percent error of Heather's calculation.
The temperature of coffee Heather measures = 133.4° F.
Coffee's actual temperature = 145° F.
So, to get the measurement in error we subtract the temperature of coffee Heather measures from coffee's actual temperature:
Now, to get the percent error:
Therefore, the percent error of Heather's calculation is 8%.